Ask your provider, we do not support third party providers neither Linux Distributions. This as also not a phpmyadmin issue, you obviously dont know where to install PHP Scripts on your VPS. I cannot tell you that. I have no clue about your server.
Actually, i really wonder why you enter
http://localhost/phpMyAdmin into your browser, your VPS server *should* have a real Domain name? "localhost" is your PC where your browser is running, instead of localhost you should provide the Domain name you reserved from your provider.