This is purely because I’m lazy and don’t want to Google it every time I need to do it.
You’ll need to login via the command line first:
mysql -u root -p
When prompted enter your root password and you should be logged into a MySQL command line.
Run these two commands to create a new user account and give it full permissions to your MySQL server. Be sure to swap out the values for ‘someuser’, ‘somehost’ and ‘somepass’
CREATE USER 'someuser'@'somehost' IDENTIFIED BY 'somepass'; GRANT ALL PRIVILEGES ON *.* TO 'someuser'@'somehost' WITH GRANT OPTION;
References
http://dev.mysql.com/doc/refman/5.5/en/adding-users.html