On an iPhone, how do I autoplay a playlist?

I found this "guide", but I can't find the repeat or shuffle buttons while using it on the mobile version. (only when I'm using a laptop)

Also, if I were to download the free youtube app, will it automatically know to use my free Wi-Fi, or will it connect to the internet provided by my phone carrier and end up charging me a lot…

Thanks in advanced!

Added (1). Note: I'm using the web version

Touch the Arrows Going Left and Right Icon And It Should Auto Play

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