Affiliate sign-up: You mention that none of the short codes work unless an affiliate logs in, howeve

You mention that none of the short codes work unless an affiliate logs in, however you don't mention how or provide a link for them to sign up, only log in. I assume they would need to sign up into our site, but as what, a subscriber, contributor, or... And please describe how to go about that so it shows up on our affiliate page. Thank you...