To add contributors, go to the project settings in the top left corner of the map and then click "Members". Then, type the person's name or username and click "add contributor."
If you are trying to add a contributor to a project owned by an organization, visit the dashboard and then switch to the settings for the organization. Then follow these three steps:
- Add the person to the organization (as a guest, member or owner)
- Assign that person to a team
- Make sure the team has access to the relevant project (either view or edit access)