To gain full access to the site, you'll need two existing members to sponsor your membership, but this is a simple process. The Sponsorship Model allows a delegation of responsibility to members for ensuring each community has high quality caches, and nothing inappropriate or illegal. Your sponsors will be responsible for reviewing and approving any caches that you want to list. The administration at TerraCaching.com does not review every cache posted. We trust members of the Community to do that and to only sponsor other members who will do the same. Your sponsors will also serve as mentors to you if you have questions or just need a hand while you're new here. Think of them as your built in TerraCaching buddies!
If you are new to the site, post a message to the "Applications for Sponsorship" Forum Topic. This allows you to introduce yourself, tell us where you're from, describe what kind of caches you like/don't like and generally eases the process of finding a sponsor. It's recommended (though not necessary) to have at least one sponsor that lives in the same region as you. These members typically have knowledge of the area, and are therefore better prepared to review your caches. You can withdraw from your sponsors at any time if you wish to switch to another -- like someone more local or that has a similar caching philosophy. Once two full members have sponsored you, you'll be a full member, free to view caches posted, post your own unique caches and even sponsor additional members once you get the hang of things!