I've received a reply and, as was said here, the contact email can be changed later. However, the WebID is set automatically, will be unique, and cannot be changed.
Thanks for your help. Reply quoted below.
[i]The email address entered cannot be the same as yours on your account.
The system will not allow it. The email address you set will be very
important, as this address is used as the contact for any billing or
support emails and is also used to verify account ownership. It will also
be an alternative to the web ID when logging into the panel and is used
to retrieve your password when using the "forgot password" feature.
It can be changed at a later time however, if needed. Just log into the
and click the "edit profile" link located at the top right.
I can't really tell you what email you should put, but it should be one
that the account owner/administrator has access to. If the account
ownership should change in the future, it is very important that the
contact address be changed at that time as well to prevent any future
problems with access or notifications.
The web ID is generated automatically by the system. It takes the first 3
letters of your first and last name and combines them. The web ID is
unique and cannot be changed.[/i]