1. Yes, I already searched here and could not find the answer. (That doesn't mean it is not here, only that I could not find it with a reasonable effort.)
2. I figured out I had to use Shift+Enter to get a line return! (Yay for me! This is soooo awkward and un-intuitive!!)
3. I guess that the "Validate Answer" is the same as marking a reply as the correct one, but this is only my guess because of #1.
4. This is soooo awkward and un-intuitive!!
5. I refuse to watch a video to learn how to navigate what should be intuitive.