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It's been a long time but How do I post to a group to request a re-posting of something?

It's broken in all the 6.90 Beta so, keep that in mind. In 6.82 right click a post and select "reply to group". By default, it'll format as a reply but you can change it into a request subject. Make sure in the poster options, the public email looks like a real email address. It doesn't have to be real.

Pick an active server. Keep in mind that many servers default to not allowing posting so, you might have to go into their account setting (on their website) to enable posting.