Allura allows for very fine grained access control options over your projects which can be a bit confusing when starting a new project.
Mainly there are two places where you can fine tune the access permissions to a project (in reverse order of priority).
- Project User permissions
- Tool specific permissions
Where (1.) defines the user groups for a project and the more general permissions for the users inside the group. And (2.) overrides (1.) with per tool/content permissions.