There isn't any joining
You just start posting. The 20 Somethings is just a section of 3FC that's for, well, people in their 20's. It's an amazingly supportive place where you find like-minded individuals who are interested in healthy living and weightloss. We post anything and everything related to weightloss and life in general (guys, school, work, and all the other dramas life has to offer
).
Welcome to the forum!