You do not need to create a login and password to use the shopping cart. Instead, when you get to part 3 of the Checkout page, click the 'Check out as a Guest' box.
If you'd like to order signed copies of his books, please mention that in the Order Comments when you check out. (Please note: the individual book listings below indicate whether we have signed copies or not. If it doesn't say signed, we do not have signed copies of that particular title.)