subdomains and direct host-url

is it treated the same

[MadMax101]

Im not too good with the server-side stuff so I might be using wrong terms or something but I hope this will be clear enough for someone to help me.

When joining adsense I entered the site name which is a subdomain a mate registered for me. So to get to the site
you use i.e. the url
h77t://subdomain/index.php
And that is the url I want my visitors to use.
But I've been recieving complaints that some people can't get to the site at all, and I'm assuming it could be because of the subdomain.
So my question is - can I place a link to the direct host url aswell:
h77t://username.host/subdomain_folder/index.php
or will google mind that people are viewieing the ads from other urls then the one i entered while registering.

[Curiosity]

Once you sign up for Google, you can put ads on any site you own without asking Google for permission. Therefore, you can definitely send visitors to a different URL on your original site.

[MadMax101]

Great, thx for the help :)