And as Donald Norman would point out, you shouldn't have to put instructions on your interface telling people how to use it (e.g. "push" and "pull" on doors).
It seems that everyone who uses this site to create a presentation is going to have to put "tap here" and "keep tapping" on the first two slides to get anyone to understand what's going on.
It looks like I wasn't the only one confused by the user interface. Losing the ability to go back and forward is also kind of annoying (tried right click).