Instructions
Go to the profile page for the clan you want to join. You can find this page by searching on clan.z8games.com or by following a link given to you by a friend or posted on a public forum. If you search on the website, set the "Game" selection on the "Clan Search" window to "CF" to indicate CrossFire.
Click the "Apply" button below the general profile information.
Log in to your Z8Games account. You will need to create an ID if you do not already have one.
Contact clan leaders or lieutenants to ask about membership. These individuals will make the decision on whether or not to accept you to the clan. Contacting these clan officers separately to argue your case may improve your chances. Find a list of clan officers on the clan profile page, and either message them in-game or send a private message on the forums. Make sure you explain why you would be an asset to their clan and why you are interested in joining. You will have a much better chance of being accepted if the officers see you as a skilled and mature player.