I'm going to bite on this also.
When you first did your sign up, you should have done the following (someone please correct me, if I'm wrong here)...
"Step 1." Put in the name of the subdomain/domain that you wanted (for example mysite.x10hosting.com), and check for availability. Then decide whether you wanted the Ad Enhanced or Ad Free plan. There's some other information in Step 1, but I can't access it without signing out first.
"Step 2" **** This is the one you're concerned with***** You needed to select a Username and password, then put your e-mail address in there. If you selected the "Ad Enhanced" package, you needed to decide what type you wanted. (Static, Dynamic, or Corporate). Then you needed to fill in your personal information. (Also you needed to check for availability of the username).
"Step 3" First of all, you needed to read the TOS and click I agree. Then you needed to sign up at this forum, and activate that account (this forum). You need to put the Username and Password that you signed up for this forum in the space, and submit the order.
You should have received four e-mails from x10hosting.com. The first one was to activate the forum Username/Password. The second one was to confirm your forum membership (Welcome to x10hosting forums). The third one should be to confirm (or activate) your actual website. Then the fourth one will verify that your site is active. The fourth e-mail is the one that you need to get your information from.
Hope this helps you out, and have a great day
Patrick.