Cpanel Probelm

When I try to veiw my CPanel...

Internal Server ErrorThe server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator, webmaster@Xisto.com and inform them of the time the error occurred, and anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.

You mean when you try to log in? I believe 403's are usually caused by wrong or lack of usernames and passwords.

Try and go directly to "[username].trap17.com:2082/login/" or "[username].astahost.com:2082/login/". I had the same problem and this solved it.Best regards, Florin.

Having an account will help you there, you can't access anything without having a hosting account.

As moonwitch said, you need a hosting account.
Make sure you you have enough hosting credits (10 or 30, depending on which type of account you want), keep posting if you don't have enough.
When you have enough, go to the hosting requests forum (it's right near the bottom) and fill a request in using the form provided.
Your account should be verified by an administrator resonably quickly. Once it has been verified, go to https://support.xisto.com/ to set it up.
You'll need to keep your hosting credits above 0 for your new site to stay up.

Registering with the forum doesn't automattically mean you get a hosting account!