I took a Mario game from the third grade multi lesson review from the Bandi book, and made it for the fourth grade Bandi book. I made a mistake, however so two slides are blank and lead to nothing

If you preview the slides on the left hand side, you will see there are two that have nothing but a background. Those are the two. I know nothing about connecting slides yet, otherwise I would have fixed it. Anyway, it goes over the whole book. Props to who uploaded the OG on the 3rd grade forum. PM me of there are any issues.
[EDIT] There are some slides that repeat. That wouldn't be an issue with me normally, but the answer is on the slide the second time around. Can anyone give me some tips one how to fix this, as well as put buttons that lead to a coin screen on the two blank slides mentioned above? It's such a great game, but there are just a few bugs.