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You would join the Marketplace user group the same way you would join other opt-in user groups: through your Account Settings. I'm not trying to be snarky, but maybe the Special Rules for Classifieds is not the place to educate members how to set up their account to opt in to groups generally. When you became a member, you probably went to your Account Settings and saw the Preferences option and adjusted some settings to customize your experience. Wouldn't that occur to most members? That said, there is a sub-forum for Frequently Asked Questions under Discover ScubaBoard, and I did not see one about setting up the basics of one's account. Maybe there should be one!Yes, but add HOW to join a user group is the suggestion. Simple.