Documenting Reality is a private, invite only community. You must follow the link in the email you received in order to register. If you do not have an invite, you can get one from someone you know who is a member of the site.
A few days a month I open the forum up to paid registration, when you purchase a membership ($10.00), you will receive instant access, with a membership for yourself, as well as a free invite for a friend.
Money collected from the memberships and invites goes directly back into the site for features, development, and content. Documenting Reality is the premiere website for reality based media. The site has been featured in just about every major news outlet across the world. It does not get any more real than what you will see here. The sale of invites and memberships is the only method in which this site gains needed revenue for it's survival.