How to change youtube quality on iPhone?

I have an iPhone 4s and at some moments when I start to watch a video, it's fine at first but in the middle of the video it starts to load again and all of a sudden the quality is s**t

You can't it should automatically change quality back to its optimum quality. (360p in small screen, HD, if possible 720 or 1080p).

It says to go to the gear icon but there nothing there but when i whatch a video its blurry

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