I am new to WHMCS. I currently have a license for the WHMCS product through my hosting company as a reseller, however it seems that I can't register on the WHMCS site for an account to get support. I am currently having an issue with my domain checker. The error is: "Domains must begin with a letter or a number." I am sure it is probably something simple, but I am new to your product. Please provide me with instructions on how to register for a customer account or some information on how to resolve my issue.