Tap Menu to bring up the Slide Switcher. Tap Play to change to a newly selected slide, or tap Menu again to dismiss the Slide Switcher.
Press and hold Menu to blank the screen. Tap Play to resume the presentation.
The hardware volume keys can also be used to advance slides. Volume up will advance the slide, while volume down returns to the previous slide. This allows you to control the presentation even with an iPhone in your pocket.
The above require Rowmote Helper 3.8.6 or later.