Looking for a web host with the following features.....?

Okay, so I recently bought a domain on xisto.com. Now, I want my domain( Without a subdomain, e.g. 'whatever.weebly.com') to show up wherever the person goes on the website. So I set up an account on zymic.com. Now, first I created an index.html page (a small one, pretty basic).I decided I wanted a homepage, and a forum. Now, the homepage shows up as mywebsite.com. But when I go to the forum directory (located in /forums/), my website shows up as mywebsite.zxq.net/forums/index.php. I want it to show up as mywebsite.com/forums/index.php. It's the subdomain. I REALLY want to get rid of that. It looks so utterly unprofessional. Does zymic have an option for this, or do I have to switch to another web host to change this? Is it even possible to rid of the subdomain?

Thanks,

Mike