You can add, delete, and edit web apps directly from the settings menu on your device.
To add a web app from the settings menu:
Tap the button or swipe from the right side of your device's screen to open the control panel. Then tap Device settings .
Scroll to and select Manage Web Apps .
Add Web App
and in the next screen, enter the name and URL. If you want your app to show up in the call controls as well as the home screen, toggle on the setting.
Tap the checkmark in the right corner to finish.
Share a web app when you're in a call
When you're in a call, swipe up on your device's home screen to open the task switcher and tap the web app button to open the app. Tap Share to share the app in call.
The web app is visible automatically to all participants in the call.