Add this wording as a nice looking heading to the login page -
You're almost done saving your design! Now choose an email address and password to save your design. If you do not create an account, you will be unable to save your design. (Notice: We do not sell or distribute your information to third parties.)
And, provide a price per piece or unit cost calculation code for each product and each quantity selected on the price popout page. (e.g., if they buy 100 and pay $[url removed, login to view] it would be 0.5 cents each piece)
Should appear on the right side of the price total that comes up.