Go through the following steps to define the default membership for project roles:

1. Navigate to Administration > System > Project roles.
2. Click on the Manage Default Members link for the project role you want to configure.
3. Click on the Edit link of the Default Users column to add users to the project role.
4. Click on the Edit link of the Default Groups column to add groups to the project role, as shown in the following screenshot:

This screenshot shows how to add groups to the project role.