Activities > New Release > Collaboration option at the top.
Once you get there, press select on the right and pick a song. (double click the song)
then it'll bring you back to the screen to pick an artist to collab with.
I just went onto my MWR1 app (I have a mac so it's the only one I can play) and it bugged out and now it won't load. I deleted it and reinstalled at the same thing happened.
**** a mess. Finally released Leave Get Out and it's critcially panned by the critics yet her music video debuted at #1 in streams and is named video of the decade.
I deleted it and reinstalled at the same thing happened.
