In a mosque for men and at home for women. After every salah/namaz do a sajda and in the sajda read Surah fatiha once only. If you cant go to the mosque then do it at home.

In the sajda when you come to “iiya ka na budu va iiya ka nasta een”. Repeat it 21 times. then complete the Surah and raise your head from the sajda. Then do a dua for your Hajat. You must do this after every salah/namaz.

This vazifa is small takes 2-3 minutes and is very powerful. Continue until your Hajat is given. Inshallah it will happen within a week.