How to close an app in ZTE Rapido?

I use a Gnex currently. I am used to closing my apps by hitting the dual window icon at the lower right of my phone and swiping the app window to the side. This shuts down the app. How do I close an app on the ZTE Rapido?

Try press and holding home key or double pressing home key. If that doesn't work, while in homescreen, press right soft touch key. Please let us know which works.

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