The idea of these is sites is to post a comment/move in whatever games take your fancy, then come back later to see what others have added. The pace is sedate - you get a few new moves on each site each day. It's a bit like Twitter in that respect, I suppose.
As far as how to play individual games, well that varies. The simplest are games like the limerick or haiku games, where you just post the next line to a limerick or haiku (OK, they're senryu really, usually with a comic tone). In most other games we're just making things up as we go along.
Are you familiar with I'm Sorry I Haven't a Clue? This site is a web-based version of this long-running comedy radio show. We try to play most of the games they play on ISIHAC, and invent our own in the same style. That's what this site – and Orange and MCiOS contain.
Actually in the photo I linked to above that's Dujon on the left, me wallaby in the middle and PaulWay dressed in a rather fetching shade of blue in the background (sorry about the poor light, you might not have seen him properly). I have met many people in the Morniverse, but not Rosie (or Dan or Dunx).
Even with my love of sub-clauses and punctuation, "With this book, you, too, can be a mystery solver!" just seems too much - especially for a back cover that is supposed to grab people's attention.
Sorry to sound harsh, but my suggestion is that you should send your two books to professional publishers, with an open and optimistic mind. Take on board their comments, because they really do know what sells, and how to sell it.