You have to be asked to join a collaboration Angel. By either the originator of the group/collaboration or a recommendation from participating decorators in the collaboration. There was a post here on CD from Tartas Impossibles aka: Isabel Tamargo on CD 2 months ago for a public FB collaboration she was running. I do believe the registration for the collaboration ends April 30th. So you still have time to join. Go on Tartas Impoosibles page here, you will see her post:
“Welcome to Sweet Summer public collab. Want to join us?”
Click on the link ….scroll down through the comments. There’s a link to the registration.
Hope this helps. 😉
Creativity is God's gift to us. Using our creativity is our gift back to God. Clarky's Cakes 😎