From b2evolution manual
This manual page is outdated. NEW PAGE: User Permissions in b2evolution v5+.
User permissions get derived from three things:
- The General application settings. For example, whether or not to disable File Upload for everyone.
- The permissions of the user Group the user belongs to.
- The permissions of the blog the user is trying to access. Note: blog permissions can be assigned to specific users individually or to groups of users.
 User Levels
See page about User levels