locating phpmyadmin login
So, I need to edit some content on a website that someone else built. It appears that it was built using joomla. http://newportsportsclub.com/
I have the ftp, but I don't know the login to joomla admin. The owner thinks he knows the phpmyadmin username and password, but I don't know what url to go to in order to reset the password for joomla.
From what I understand I can only reset the password using phpmyadmin. Oh and of course we don't have access to the email that is set up for the admin on joomla.
How do I figure out the phpmyadmin url??
thanks in advance.