Hadith & Sunnah is forbidden by Quran

The Quran says to be respectful for your parents. How do you that? It also says to leave a will. How do you that? It also says to praise God and fear him. How do you that. It says to spend on the poor and on freeing the slaves and on the relatives. How do you that? The Quran says we must ask for forgiveness. How do we do that? The Quran says we must fulfill our obligations. How do we do that? The Quran says we should recite the Quran. How do we do that? It says we can eat food. How do we do that? It says we can even drink water and milk. How do we that? In fact it says we can also sleep. How do we do that? It says we should think of of God and His creation of the universe. How do we do that?

You ask strange questions. All you want to say is we can not know "how to pray" from the Quran therefore the Quran is insufficient.

Then tell me this. Where in the Quran it says we need to know how to pray?