Roles-and-Permissions.md

@@ -4,6 +4,11 @@ The following document describes the various roles in OSEM and their current per
 OSEM comes with role-based administration for the conferences. 
 
 Except for roles, there is also the `is_admin` attribute in User model, which gives the user access everywhere.
+The first user that signs up automatically becomes an admin (has the attribute is_admin enabled). 
+
+To make another user an admin:
+* Use the admin panel to edit a user, and check the is_admin checkbox
+* Run the command: rake user:admin['email_of_existing_user']
 
 ### Role Definition