Click on the site and it should bring you there. You are then taken to a join form where you need to enter in your info. Fill in the required information. For age verification purposes only they require a credit card. United States Federal Law requires proof of age to view adult material .
Credit cards are a valid form of verification.
They won't charge you for the free pass. Read their Terms and Conditions. If you decide to become a member then you may. Most people love these sites and end up being members. We get emails all the time from people thanking us.