You must be Group Admin of a Personal Group to add or remove a Group Administrator of a Personal Group. To add or remove a Group Administrators of a Personal Group, you must be Group Admin of the Personal Group, to add and remove Group Administrators of the Personal Group.  From the Personal Group page, click on Group Administration > Manage Group administrators, here you will see a list of your Friends on Clubster, then search and check the box of the Friend or Friends you wish to add as Group Administrators, and click Invite Selected Friends.  These Friends will now be Group Administrators of the group.  Only Friends of the creator of the Personal Group can be added as Group Administrators of the Personal Group.