Groups
Click on the "Groups" button at the top. A list of the groups will appear. Click on the Title and a page will appear with a list of topics on the right and a photo on the left. Under the photo will be a place marked "Join Group", click on that. At some, you will become an instant member and at others it will require permission from the Moderator.
click on Groups tab. Find a group you'd like to participate in and contribute to. Join the group. Some groups are "Open to All", which means you'll automatically be a group member after you select the "Join Group" button. Others need group moderator approval. Some groups have specific rules to join.
You can search for groups by name or interest in the search window or you can scroll through the 100's of groups alphabetically.
hahaha ... Shavednudist and I must have been typing at the same time and he beat me to the reply button! :D