have you tried going to
https://x10hosting.com/sso/login
then clicking the link that says "cant access your account?"
which should allow you to change your password.
phpmyadmin is usually accessible after you create a
mysql database, there is not usually an email sent for this.
if you forget the password you used when you created the database
you can first click the name of your mysql database,
then you will see a "change password" option
i dont think you can sign up directly to phpmyadmin.
ive never seen that option myself.