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.
Tap 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.