Project permissions are found in the individual project settings page, and project groups are in the "manage projects" settings page.
You can set view and edit rights. Edit encompasses creating/updating/deleting all resources within a project. For full access, a user must be a viewer and an editor. No permissions set means the project is public.
If you're the orgs owner account, you'll have access to view and edit all projects in case someone accidentally locks themselves or you out of a project.
