Samsung Galaxy S6 Edge: How to Setup Daydream in Android 5.1.1 Lollipop

Daydream is a feature in Samsung Galaxy S6 Edge that can be used to set your phone to launch a screensaver(e.g., photos in your phone, photos in your Google account, a color change effect, etc.) when your phone is charging or connected to a desktop dock. It can be an alternative way to make your phone to be more attractive if you're bored with that black screen while your phone is charging or