Welcome on 110mb.

First of all - you have no any index.htm/html/php in your root folder. ROOT, not installation/ which doesn't apparently exist. Remember also about that the Linux systems are case sensitive, so
Index.php is not the same as
index.php etc.
If you put a valid index.html / index.htm / index.php in your root folder - this will be your home page.
As for how to point your own domain - you have to buy it then you got two options:
http://www.110mb.com/forum/how-do-i-change-my-domain-dns-records-t32010.0.html;msg268633#msg268633I recommend to use external nameservers.
And about downloading and not displaying .php files - I can see that there was some temp problems with the server/box14 and that's why that was not working correctly, just a bad timing to do your tests.
