Its simple !
Connect via ssh to your VPS server, then run :
Just run
apt-get install phpmyadmin
Then on the blue screen that appears, choose apache2 using the space bar, then <tab> to <ok> and press enter.
On the next dialoge box, Choose 'Yes' to 'configure database for phpmadmin with dbconfig-common' .
on the next 2 sceens leave the password blank choosing ok
then set a password for the root user
using the following :
mysqladmin password yoursecretpassword
remember to change yoursecretpassword to some password and remember this !
then run
/etc/init.d/apache2 restart
now you can goto
http://ipaddressofyourvbpsserver/phpmyadmin/
and access with the username : root , and the password you set above.