Core Contributors are the people closely associated with your Project, who will show up on your Project page as part of the team.
Project Admins are Core Contributors with extra permissions, like editing the Project settings and approving expenses. Admins get notifications of activity on your Project.
1. Go to your Project page and click the gear next to your Project logo.
2. Head to the Core Contributors tab. Here you can add, remove, or change people and roles.
3. Once you are done, click on Save at the bottom of the page.