While the application is in Lock move (activated) there is no way of uninstalling it because it will not appear in Add/Remove programs. In this case, as stated on the support page, you will need to contact the team and explain the situation because they will be issuing a new password and username which will enable uninstalling.
A quote from the developer regarding password and username upon uninstalling:
This is security measure preventing unauthorized application removal. If you are having problems with removing FB Limiter please write to support@facebooklimiter.com.
