Hiiii! This is a tutorial thread regarding joining/creating groups. :)
Click images to enlarge.
Step 1: Go to your profile
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Step 2: Scroll down until you see "Join Groups" on the left side.
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Step 3: The button the very left side "Create Group" is pretty self-explanatory. Once you click it, it will then take you to a page where you can name your group and fill out details for it.
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Step 4: To join groups, just look for a "Join" button and that will either instantly accept you into the group, or a request to join will be sent to the group leader and they will then decide if you can join or not.
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Enjoy! :p