Map making is often a collaborative process. To be able to work with others on a map, the platform work is team-based. - create a new teamIf you make the map on your own, you will be the only one in the team.
If you'd like to add other people, there are multiple roles you can assign. Once someone has an account on new.opengreenmap.org you can search them based on the email address of their account. Then choose the role.Green Map Berlin team