Access Login screen

[genesisrage]

im using a vps where my hostname is not an actual domain name i own, so it says to goto admin.mysite.vps... which doesnt actually exist.

i can access from the ip address, but would like an easier way. or even allowing some kind of symbolic like such as hostedsite.com/ispcp would goto the login screen. (even for all sites)

that or what need to be edited so it looks for admin.hostedsite.com instead of admin.mysite.vps