Hi, Great question and something all instructors should do to further help their students! My advice is to create a bonus lecture and talk about the group in there. Make your promises of what they will get ie the extra support, then show the link to join. Unfortunately you can't add the link into your description (or even make a description for the bonus lecture) but you can certainly flash the link on the screen. Also, if you use some video hosting services, you can add clickable links into your videos! I'm just testing this out myself with the video host I use. Fingers crossed it works:)
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