Click on the "Join" link in the ring options & that should take you to the registration information. Once you submit that you'll be taken to a page with the ring code fragment. You copy that and paste it to your page.
Also when you submit your registration - you're sent an email that verifies your information and the ring code is also included there - however it may be without your personal information included into it. So your best bet is to CCP the information from the page you're taken to after you submit the form.