Can't seem to be able to buy second domain name from you

Can't seem to be able to buy second domain name from you

Hi

I have a standard subscription with you and you host a domain that I purchased from you.

I would like to buy a second domain name from you and have you host it. I can't seem to find a way to add a second domain to my existing subscription / account.

As an alternative I have tried registering a new subscription / account but there is no option to buy a new domain as it requires me to enter details of an existing domain I already own (and of course I don't own it yet as I want to buy it from you).

Adding another domain to my existing account (and adding an extra user) would be the simplest from my point of view if it is possible.

Please can you tell me how to do this.

Thanks

Julian