To expand on what Forester said, the CC-Roleplay is basically an open-ended story, set within the space shown in the CC-Roleplay
map.
Basically, everyone creates one or more characters, and then tells their story, including any and all interactions with the other characters. The main rule in doing so is that you must keep the "autoing" (that is, the actions of other people's characters) within the character of that person. Also, anything written in the Roleplay is set in stone. Unless it is found to be in contravention of the rules, in which case it will be modified or deleted.
Before you can join, you need to read all of the Roleplay up to this poin (or at least the previous 5 months or so, in addition to recaps), as well as all the rules and character bios. I'll also link you to the
RulesPage. The Bios can also be found on the Gaming Page (up from the Rules).
If you have any further questions, they can be asked here in this thread. We'll do our best to answer.
Michael A. Joosten - Gaming Moderator