On an iphone 5, How does one listen to youtube while on another web page?

Atm I'm either stuck on the utube page or the vid stops playing. Please don't direct me to a utube vid, only tell me if you have an iPhone 5 and can do it. I've seen it done on the 4s. Detailed instructions appreciated
Ty

Watch this tutorial video to listen to youtube while doing other things.

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