There are three account types: basic, privileged, and contributor.
|Basic||Free||You can upload around 80 posts a day, post up to 6 comments in an hour, and search up to two tags at a time. Any post you upload will be subject to moderation.|
|Privileged||Invite only||You no longer see ads or 503 pages, and you can search up to six tags at once. You can subscribe to tags. You can vote on posts. You can see hidden tags. You can see who favorited a post.|
|Contributor||Invite only, consistent quality uploads||Your posts are no longer subject to moderation.|
Registration for basic accounts is free and open. To get a privileged account, help with tagging/identifying models/characters/etc or contribute uploads.
See the signup page for more details.