This article will explain how to install the Zenbooker web app on your phone.
Android
On your Android device, open Chrome
Go to Zenbooker.com/apps
Log in if necessary
Tap "Install" and then tap "Install" again when the pop-up appears
iOS
On your iPhone or iPad, open Safari
Go to Zenbooker.com/apps
Log in if necessary
Click on the Share icon - the box with an arrow coming out of it. For Safari users, this button is at the bottom of the screen. For Chrome users, it's found at the top-right of the screen.
Scroll down and tap "Add to Home Screen"
Tap the "Add" button at the top right of the screen