Locked Out

I'm a developer and installed WebWiz forums for a client several years ago.  As employees have come and gone, they have lost access to the Forums as administrator.  They can still access to post/respond, but lack the ability to delete users and threads.  Is there a way to restore/recreate an Adminstation user?  If possible I'd like to do this and still maintain the existing users and discussion threads.  But, if that's not possible, I'm open to starting from scratch.