To uninstall the app from your iPhone or iPad:
Tap and hold the app icon until all the icons start wiggling.
Tap the little X at the top left of the app icon, and confirm you want to delete the app.
To uninstall the app from your Android phone or tablet:
Go to your device's Settings menu > Apps or Application manager (this may differ depending on your device).
Tap the app you'd like to uninstall.
Touch uninstall
Remove app from Windows
Go to the start screen by pressing the Windows button underneath your device's screen.
Place your finger anywhere on it's the screen and swipe upward to reveal the list of installed apps.
Tap on the app and hold it there for a few seconds.
Click or tap on the trash can icon in the bottom-left corner of the app bar labelled Uninstall.