10- How to perform 3rd & 4th Rakaat

3rd Rakaat:
If this prayer is farz or sunnah mu-akkada, then stand up for the third rak'at immediately after tashahhud.
If by mistake you read Durood Ibrahimi, Sajdah Sahu will become obligatory.
Say Allahu Akbar while standing for the third Rak'at
If this prayer is Sunnah, non-Mu-akkadah or Nafl, then the third rak'ah should also begin with Sana, ta'awz, and tasmiyyah.
If this prayer is farz, witr (obligatory), or sunnah mu-akkadah, then the third rak'ah should begin with Tasmiyah only.
Reciting Surah Al-Fatiha:
If this prayer is not Farz
(i.e. Sunnah Mu-akkadah, Sunnah non-Mu-akkadah, Nafl or Witr) So reciting Surah Al-Fatiha in the 3rd and 4th rakats is Wajib.
Reciting Surah Al-Fatiha:
If this prayer is Farz, So reciting Surah Al-Fatiha in the 3rd and 4th rakats is Sunnah.
Reciting any Surah:
If this prayer is not Farz
(i.e. Sunnah Mu-akkadah, Sunnah non-Mu-akkadah, Nafl or Witr) So add a surah after Surah al-Fatihah 3rd and 4th rakats. It is Wajib.
No Surah should be recited:
If this prayer is Farz, then do not recite any Surah after Surah Al-Fatiha in the 3rd and 4th rakats.
If this prayer is witr, then after reciting it, do Rafa Yadain, i.e raisa both hands.
Saying Takbeer e Qunut (i.e. Allahu Akbar).
Keep both hands again on your chest
Recite Dua-e-Qunoot
Now complete this rak'at till bowing and prostration.

4th Rakaat:
After completing Sajdah, stand up for the 4th Raka’at saying Allahu Akbar. Qiyam is Farz while saying Allah o Akbar is Sunnah.
In the 4th rak'at, recite only Tasmiyah before the Qiraat
Now complete this rak'at till bowing and prostration
While getting up from the second Sajdah, he should sit in Qaada Akhira while saying Allahu Akbar