You can manage all your Open Green Maps in the ‘My OGM’ link located at the top of the screen.
Under roles on the Open Green Map platform, Mapmakers are called Team Leaders. When logged in, each map's map Team Member list is accessed from a tab over the map. Later, more team organization tools will be added here.
The Mapmaker can invite a Coordinator(s) or Team Members to help create and manage each OGM map. Both can add new sites that will appear instantly, with their username on the bottom of each site.
The Coordinator has additional permissions so they can help manage the project. Coordinators can edit any of the sites on the map, invite team members and make widgets.
If you seek help, on the Map form, enable requests under Building Your Map Team (access by clicking Edit above your map).