I am an admin so my screen probably looks a little diff than yours might. Would you go ask one of the members who have joined in the same question? They can look at their screen and tell you where the 'join' button is.
I also need you to go to the zap site and invite all tennesseans to join you in our TN group on this site for event planning. Especially the ones from Memphis. We need to put together a good group for spring events. We have something pretty cool coming in the summer as well.