To present a deck, select Present from your profile page. You can also append /live to the deck URL: slides.com/<username>/<deck-name>/live.

The present view lets you enter full screen and show or hide presentation controls. When you are ready, select Start presentation to hide the setup controls.

Speaker view
The present view is intended for your audience, while the speaker view is visible only to you. Navigating in either view keeps the other synchronized.
Present live
Send viewers the live presentation link to let them follow along from their own browsers. Their view stays synchronized as you present.
Remote control
Use a phone or other touch-enabled device to control your presentation remotely with swipe gestures. The remote control also shows speaker notes and the number of live viewers.