Should the Qunut (a form of supplication recited in Prayer) be said before or after Ruku` (bowing)? What is the form of Du`a' (supplication) authentically reported to be recited in Qunut? Can we add anything to it?
What does (Part No. 7; Page No. 185) a Ma'mum (a person being led by an Imam in Prayer) say when the Imam (leader of congregational Prayer) supplicates Allah and praises Him?
The authentic opinion is that it is better for the Du`a' of Qunut to be said in the Witr (Prayer with an odd number of units) after, not before, Ruku`, as there are many authentically reported Hadiths which were narrated concerning this.
A person can supplicate Allah in Qunut using the authentically reported forms of Du`a' or anything else, which they might need in this world or in the Hereafter.
A Ma'mum should say Amen after the Du`a' of the Imam. They can praise Allah and glorify Him when the Imam does, or remain silent.