I'm not sure you can help, but I too have my own domain already registered.
I signed up w/ TCH as my new host, but I discovered (while trying to update the DNS pointers) that my registrar contact info was outdated (cardinal sin, I know) - specifically, the contact email address listed, goes to a domain that I don't own any more, worse yet, it's owned by someone else.
I emailed my registrar (Joker.com) a week ago and haven't received a response yet.
I realize that it may vary from registrar to registrar, but in brief: I need to know of another way to update my DNS pointers, besides via an access through the contact email address listed on the domain ownership form.
There must be another way for my registrar to verify that I own that domain, and thus allow me to make changes.
If you have any thoughts, I would appreciate them, as I'd like to get crack'n on putting a site up on your server ASAP.
Thank you for your response.