Acer B1-720 - Manual (Page 27)

Going online - 27
Uninstalling downloaded applications
Once you’ve downloaded and installed an application, you may
uninstall the application from APPS > Settings > Apps, then select
the the app you wish to uninstall and tap Uninstall. Deleting an app
icon from the Home screen only deletes the shortcut.
Google Hangouts
Tap Hangouts from the application menu to open Google Hangouts.
Here you can see a list of your contacts connected to Google
Hangouts services. Tap on a contact to open a chat session. After you
have connected, you can open a video chat session.