Trying to run phpmyadmin commands gives error

So I'm trying to make a site for school with a MySQL database on InfinityFree, but when I run the command "CREATE USER 'username'@'localhost' IDENTIFIED BY 'password';" in the phpmyadmin console I get the error "#1227 - Access denied; you need (at least one of) the CREATE USER privilege(s) for this operation", but I don't know how to give myself CREATE USER privileges with InfinityFree phpMyAdmin.