Set slides to advance on click or automatically in Keynote for iCloud

By default, all new slides are set to advance manually (for example, when you press the Space bar). You can also set your slides to advance automatically after a number of seconds.

Select a slide thumbnail in the slide navigator (on the left).
Click the Animate button in the toolbar.
In the Animate sidebar on the right, click the Start Transition pop-up menu, then choose an option:
- On Click: Advances to the next slide manually (when you press the mouse button, Space bar, or an arrow key).
- Automatically: Advances to the next slide automatically after a period of time. Type the number of seconds (or drag the Delay slider) that you want the current slide to show before advancing to the next one.

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Keynote User Guide for iCloud

Set slides to advance on click or automatically in Keynote for iCloud