How do i as music?

I got this app about 10 minutes trying to figure out how to get music, it told me to sign in my google docs, I used my useless account just in case they might steal from the real one, I log into it it says that Im "logged in" but I dont see a difference, Im going to keep the app just in case but for now Im giving it 3 ⭐️

Butterbrine83 about Evermusic offline music player, v2.3