To change username

[vetrib2w]

hi,
I need to know
1. How to create new user in mysql (im using WAMP )?
2. How to change username ?
3. Can i hide my databases for other user.....

guide me plz....
thanks in advance...............

[debug]

rtfm )
http://dev.mysql.com/doc/refman/5.0/en/user-account-manageme nt.html