I was looking for this for some time ;P I could not find it so i figured it out myself. Its simple :P
Make sure you've got mySQL open.
1)Go to navicat
2)Connect to your Database
3)Click 'logon' (its on the left hand side of navicat)
4)Click 'Accounts' Should be 3rd thing down.
5)Find the account you want, Then where it says 'gm' at the top (should be 4th collum) type 'az' this will make them a admin.
If this needs pictures tell me and ill try to upload some. I posted this because i could not find a tutorial with this information in.