How do I pay UE4 the 5% gross revenues?

I know that once people who start making over $3000 from the game they sold, they have to start paying epic games a 5% fee. where would I go to do this? (My game is out but right now its free and not making any money.)

Hello.

You will find the information you need on this page: Release and Royalty Tracking Guidelines - Unreal Engine

Cheers, and congratulations on releasing a game!