How to change the fav list to a repeater that works?

paföng-app-prototyp-v8.5.rp (7.6 MB)

Hello,

I’m currently working on a group project for a semester grade.
We want to implement a repeater-function, so that the users prefered items go in their favourite list. But we started doing it so that its more complicated now and we can’t find a solution.Pls help <3