How to use multitasking on an iphone 6 plus?

I double soft tap the giant circle button and half the screen goes to the bottom. And the top is just blank.

But I've seen people play music, browse the internet or look at images. They can use both screens.

How do I put something in the other half of the screen? Instead of just have my stuff get squished down to the bottom for absolutely no effect.

Double tapping the Home button (giant circle button) activates Reachability which brings the display down to half to be able to reach for the controls on the top half.

Double clicking the Home button brings you to the multitasking switcher.

What you've seen is either through other phones, not iPhones or through a jailbroken iPhone. On a stock one you can't put anything there as again that's not how Reachability is for.

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