A wall is a way for you to post a quick message to fellow members. Just click on a different member's Avatar and you will go to their profile. Once there, you can post a message on their wall if you so desire.
Welcome to CC, by the way!![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
Welcome to CC, by the way!