This FAQ item will help you enable Kiosk Mode on your iPad.

Enable Guided Access

Go to Settings -> General -> Display & Brightness and set Auto-Lock to never.

Go to Settings -> General -> Accessibility, scroll down and tap on Guided Access. 

Turn it on and configure a passcode under Passcode Settings, do not forget to also turn on Mirror Display Auto-Lock. Otherwise the iPad will lock after 20 minutes even if it is in Guided Access mode.

Next, go back to the menu General -> Accessibility and go to Accessibility Shortcut.

Change this setting to Guided Access:

Now, boot up the Vizito app and triple-click the Home button to go to the Guided Access menu. Disable Sleep/Wake button, Volume Buttons and Motion under Hardware Buttons:

Click on Start and Guided Access will be enabled:

Disable Guided Access

To stop Guided Access, triple-click the home button again and enter the passcode. Tap on Stop.

This FAQ item will help you enable Kiosk Mode on your Android Tablet.

Enable App Pinning

Open Settings on your tablet and go to Security & location -> Screen lock and set this setting to pin.

Next, in Settings under Security & location go to Screen pinning and turn this feature on. Select Ask for PIN before unpinning and select Don't show notifications at all:

Now, go to the home screen and start the Vizito app and tap on the app switcher icon:

Tap on the pin in the bottom right corner of the Vizito app to start 'pinning' the Vizito app.

Disable App Pinning

To stop pinning apps, tap & hold Back and Overview buttons until the lock screen is displayed. Provide your pincode to unlock the device and App Pinning is disabled.