Whenever you click on protected content you will be presented with a registration screen.. Just fill in the signup form and be sure to enter any Voucher code you may have, and you'll be all set.
If you have a Voucher Code, or a Discount jCode - just enter it when you initially sign up as a Subsciber. If you receive a new Voucher Code, you will need to terminate your current Subscription, and then sign up again with you new Voucher Code.
There are a variety of Subscription Types. You can sign up as a full member. You can sign up for a PPV event which will give you access to an indivual event. You can sign up with a discount Voucher that will give you a particular discount based on the type of voucher.