Open the app that you want. On an iPhone X or later, triple-click the side button. On an iPhone 8 or earler, triple-click the Home button. If you want parts of your screen to stop responding to touch, use one finger to circle those areas. You can move or resize the circle, or tap the X to remove it. Tap Guided Access, then tap Start.

Or to start a Guided Access session with Siri*, open the app that you want, then tell Siri "Turn on Guided Access."

*Siri features might vary by country or region.