why do you care what the user ID is?
Are you just trying to make it so the UID is the next number in the sequence? If so, I believe this is the correct query to run in PHPMyAdmin
ALTER TABLE mybb_users AUTO_INCREMENT='x'
Replace X with the what would be the next number.
XD
AUTO_INCREMENT didn't came in my mind
I edited AUTO_INCREMENT and everything is fine
thx man...u saved the day