There is no repeat button which would play your video again.
However you may do the following:
1. To prevent jumping to the next slide automatically make 'advance by user option' yes for that slide. This can be done from Presenter->Slide Manager. Select the slide and select advance by user as Yes.
2. Also you may go to the beginning of the video by clciking anytime at the start of progress bar on the playbar.
let me know if you need any other help.
Adobe Presenter Engineering Team