AWESOME but... – Zing Studio 1.0 Review

This app is AWESOME ? for stop motion videos and stuff but HOW DO YOU MAKE GREEN SCREEN????!! I mean, I know you’re supposed to do a green background but where are the buttons to choose what background you want to make it look like the Stikbot’s in a place? PLEASE REPLY TO MY QUESTION‼️
Review by Themillers098 on Zing Studio 1.0.