You're missing a bit of information there... what password and username? Do you mean login credentials used to access a MySQL server? (And second, are you even talking about a MySQL server? I'm assuming that "phpMyinfo" was supposed to be "phpMyAdmin" .. ?) If so, what kind of privileges should that new account have? What hosts should be allowed to use that account?
Making a bunch of assumptions to the above unanswered questions, here's one example:
CREATE DATABASE foo;
GRANT ALL
ON foo.*
TO 'foo_user'@'localhost'
IDENTIFIED BY 'foo_user_password';