To whitelist, you need to join the forum. You must join the forum with the same username as your Minecraft game name. Your forum account is then linked to your in game account. Any promotions or group changes on the forum or game will result in the same in the game. Your username IS case sensitive. If you already have a forum account with a different username, PM me with both and I'll update your forum account username for you.
When you register, you will immediately be what is called "greylisted" on the server when you register. This means that you can wander around, look and chat, but you cannot build or interact. Once you have made 3 approved posts, you will be automatically full whitelisted as a builder and will no longer need preapproval to post in the forums. This method is to discourage griefers and spambots. You will find that it only poses a very minor inconvenience.
You must read and agree to the rules: Shown here (subject to change without notice).