I'm not exactly sure what you mean. If you created a profile, you should be the manager by default. Do you mean you changed the manager, you added another WikiTree user, set them as the manager, and then removed yourself as a manager? If so, I'm afraid there's no solution but to ask this other person to add you back.
See http://www.wikitree.com/wiki/Profile_Manager for more info.
If this doesn't answer your question, post again with the WikiTree ID of the profile and specifics of exactly what happened.