That's a little trickier, because the "main info" is kept at the top-tab level (under "Registration"). In the situation you have, where you've clicked down to the Membership List, the way to go back up to the How to Register information is to click on the Registration tab again, not to click one of the other second-level tabs. I've tried a version of what you suggest, with a "How to Register" tab that recaps the first-level page data's first paragraph and then links back to that first-level page.
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