You should be able to find a "Search(magnifying glass)" option at the right-top corner on YouTube app homepage. If you see otherwise, try uninstalling the app, restarting your device and reinstalling it. Let us know if that does the trick.
@TeamYouTube there isn't an option to search on mobile anymore?!
@killerxofall https://goo.gl/1csaf1 @TrendLib
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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