Hi Anushka,
EIther you can click on the Team tab and add your teammates there by entering their Mendix Email ID, or you can click on the '+' button that is present on the right side of the Buzz dashboard.
After entering the ID, select their role in the project and invite them.
You can refer to the image below
Hope it helps!
Hi Anushka,
Team members are supposed to commit, push and pull to collaborate and work. please go through this detailed document
https://docs.mendix.com/refguide/version-control/