You may then offer a two-unit prayer and when you finish, you may say the Dua below:
اَللَّهُمَّ إِنِّي لَكَ صَلَّيْتُ
allahumma inni laka sallaytu
O Allah, I have offered a prayer for You
وَلَكَ رَكَعْتُ وَلَكَ سَجَدْتُ
wa laka raka`tu wa laka sajadtu
and I have genuflected and prostrated myself for You
وَحْدَكَ لاََ شَرِيكَ لَكَ
wahdaka la sharika laka
alone without setting any partner to You,
فَإِنَّهُ لاََ تَجُوزُ ٱلصَّلاَةُ
fa'innahu la tajuzu alssalatu
because prayers,
وَٱلرُّكُوعُ وَٱلسُّجُودُ إِلاَّ لَكَ
walrruku`u walssujudu illa laka
genuflections, and prostrations are illegal for anyone save You,
لاِنَّكَ انْتَ ٱللَّهُ لاََ إِلٰهَ إِلاَّ انْتَ
li'annaka anta allahu alladhi la ilaha illa anta
because You are Allah; there is no god save You.
اَللَّهُمَّ صَلِّ عَلَىٰ مُحَمَّدٍ وَآلِ مُحَمَّدٍٍ
allahumma salli `ala muhammadin wa ali muhammadin
O Allah, (please) send blessings upon Muhammad and the Household of Muhammad,
وَابْلِغْهُمْ عَنِّي افْضَلَ ٱلسَّلاَمِ وَٱلتَّحِيَّةِ
wa ablighhum `anni afdala alssalami walttahiyyati
convey to them the most favorite salutations and greetings from me,
وَٱرْدُدْ عَلَيَّ مِنْهُمُ ٱلسَّلاَمَ
wardud `alayya minhum alssalama
and convey to me their response to my greeting.
اَللَّهُمَّ وَهَاتَانِ ٱلرَّكْعَتَانِ هَدِيَّةٌ مِنِّي
allahumma wa hatani alrrak`atani hadiyyatun minni
O Allah, these two units of prayer are a present from me
إِلَىٰ سَيِّدِي ٱلْحُسَيْنِ بْنِ عَلِيِّ
ila sayyidi alhusayni ibni `aliyyin
to my master al-Husayn the son of `Ali,
عَلَيْهِمَا ٱلسَّلاَمُ
`alayhima alssalamu
peace be upon both of them.
اَللَّهُمَّ صَلِّ عَلَىٰ مُحَمَّدٍ وَعَلَيْهِ
allahumma salli `ala muhammadin wa `alayhi
O Allah, send blessings upon Muhammad and upon him,
وَتَقَبَّلْهُمَا مِنِّي وَٱجْزِنِي عَليْهِمَا
wa taqabbalhuma minni wajzini `alayhima
accept these two units of prayer from me, and reward me for them
افْضَلَ امَلِي وَرَجَائِي فِيكَ وَفِي وَلِيِّكَ
afdala amali wa raja'i fika wa fi waliyyika
by granting me the best of my hope and expectation in you and in Your Friend,
يَا وَلِيَّ ٱلْمُؤْمِنِينَ
ya waliyya almu'minina
O Guardian of the believers!
اَلسَّلاَمُ عَلَىٰ ٱلْحُسَيْنِ بْنِ عَلِيٍّ
alssalamu `ala alhusayni ibni `aliyyin
Peace be upon al-Husayn the son of `Ali,
ٱلْمَظْلُومِ ٱلشَّهِيدِ
almazlumi alshshahidi
the wronged and martyred,
قَتِيلِ ٱلْعَبَرَاتِ
qatili al`abarati
the victim of shed tears,
وَاسِيرِ ٱلْكُرُبَاتِ
wa asiri alkurubati
and the captive of agonies.
اَللَّهُمَّ إِنِّي اشْهَدُ انَّهُ وَلِيُّكَ وَٱبْنُ وَلِيِّكَ
allahumma inna ashhadu annahu waliyyuka wabnu waliyyika
O Allah, I do bear witness that he is Your intimate friend and the son of Your intimate friend
وَصَفِيُّكَ ٱلثَّائِرُ بِحَقِّكَ
wa safiyyuka alththa'iru bihaqqika
and Your choicest one who revolted to demand with Your right.
اكْرَمْتَهُ بِكَرَامَتِكَ
akramtahu bikaramatika
You have thus honored him with Your honor,
وَخَتَمْتَ لَهُ بِٱلشَّهَادَةِ
wa khatamta lahu bilshshahadati
sealed his lifetime with martyrdom,
وَجَعَلْتَهُ سَيِّداً مِنَ ٱلسَّادَةِ
wa ja`altahu sayyidan min alssadati
made him one of the chiefs
وَقَائِداً مِنَ ٱلْقَادَةِ
wa qa'idan min alqadati
and one of the leaders,
وَاكْرَمْتَهُ بِطِيبِ ٱلْوِلاَدَةِ
wa akramtahu bitibi alwiladati
honored him with immaculate birth,
وَاعْطَيْتَهُ مَوَاريثَ ٱلانْبِيَاءِ
wa a`taytahu maAshura al-anbiya'i
gave him the inheritances of the prophets,
وَجَعَلْتَهُ حُجَّةً عَلَىٰ خَلْقِكَ مِنَ ٱلاوْصِيَاءِ
wa ja`altahu hujjatan `ala khalqika min al-awsiya'i
and made him argument against Your creatures and one of the Successors.
فَاعْذَرَ فِي ٱلدُّعَاءِ
fa'a`dhara fi alddu`a'i
So, he called to You flawlessly,
وَمَنَحَ ٱلنَّصِيحَةَ
wa manaha alnnasihata
gave advice,
وَبَذَلَ مُهْجَتَهُ فِيكَ
wa badhala muhjatahu fika
and sacrificed himself for Your sake
حَتَّىٰ ٱسْتَنْقَذَ عِبَادَكَ مِنَ ٱلْجَهَالَةِ وَحَيْرَةِ ٱلضَّلاَلَةِ
hatta istanqadha `ibadaka min aljahalati wa hayrati alddalalati
until he could save Your servants from ignorance and perplexity of straying off.
وَقَدْ تَوَازَرَ عَلَيْهِ مَنْ غَرَّتْهُ ٱلدُّنْيَا
wa qad tawazara `alayhi man gharrat-hu alddunya
Yet, those whom were seduced by this worldly life,
وَبَاعَ حَظَّهُ مِنَ ٱلآخِرَةِ بِٱلادْنَىٰ
wa ba`a hazzahu min al-akhirati bil-adna
those who sold their share of the Hereafter with the lowly price,
وَتَرَدَّىٰ فِي هَوَاهُ
wa taradda fi hawahu
those who perished because of following their desires,
وَاسْخَطَكَ وَاسْخَطَ نَبِيَّكَ
wa askhataka wa askhata nabiyyaka
those who brought to themselves Your wrath and the wrath of Your Prophet,
وَاطَاعَ مِنْ عِبَادِكَ اوْلِي ٱلشِّقَاقِ وَٱلنِّفَاقِ
wa ata`a min `ibadika uli alshshiqaqi walnnifaqi
and those who obeyed the dissident and hypocritical servants of You
وَحَمَلَةَ ٱلاوْزَارِ ٱلْمُسْتَوْجِبِينَ ٱلنَّارَ
wa hamalata al-awzari almustawjibina alnnara
and the bearers of the burdens (of sins) who deserve Hellfire—all those supported each other against him;
فَجَاهَدَهُمْ فِيكَ صَابِراً مُحْتَسِباً
fajahadahum fika sabiran muhtasiban
so, he fought against them with steadfastness and expectation of Your reward,
مُقْبِلاًَ غَيْرَ مُدْبِرٍ
muqbilan ghayra mudbirin
facing them courageously, never turning back,
لاََ تَاخُذُهُ فِي ٱللَّهِ لَوْمَةُ لاَئِمٍ
la ta'khudhuhu fi allahi lawmatu la'imin
and never fearing the blame of anyone concerning carrying out his duty towards You
حَتَّىٰ سُفِكَ فِي طَاعَتِكَ دَمُهُ
hatta sufika fi ta`atika damuhu
until his blood was shed while he was in obedience to You
وَٱسْتُبيحَ حَرِيـمُهُ
wastubiha harimuhu
and his inviolability was also infringed.
اَللَّهُمَّ ٱلْعَنْهُمْ لَعْناً وَبِيلاًَ
allahumma il`anhum la`nan wabilan
O Allah, curse them with incessant curses
وَعَذِّبْهُمْ عَذَاباً الِيماً
wa `adhdhibhum `adhaban aliman
and chastise them with painful chastisement
Text, translation and recitation from Duas.org