domain name on x10hosting free account

[nightfiretiger20]

hello, I signed up for an x10 free account yesterday. I had my website up and running through FTP. (I use Dreamweaver CS4 to make websites). The URL was working perfectly fine for several hours. However, late yesterday evening when I typed in my URL, x10hosting says the website domain is not registered. I have tried many, many URLs to try and get to my site. Nothing works. Is there something specific I need to do in order to make my URL work?

EDIT: I've purchased a domain name now, but I can't park the domain. it gives me the "wrapper" error. Anyway that can be fixed?