[otrs] accidentally set the admin account to 'invalid'

Hello everyone, My Admin account in my OTRS installation has accidentally been set to 'invalid' in the Group Management Page. Now the "admin" portion of the page has cannot be seen. Now, whenever I click on " Don't work with UserID 1 (System account)! Create new users!", it says " No Permission! Message: No Permission to use this frontend module! How do i set it back to being 'valid' in the database? Which tables,fields shall I toggle? Thanks in advance.