Uh… are you on mobile or desktop/laptop? Because on mobile you have to have premium to leave a comment while something is playing, since the comments have been moved to a different spot.
[EDIT: no you don’t, you can comment while watching, idk what I was thinking. But it won’t let you interact with the video (pause, skip ads, etc.) while commenting.]
Also, maybe a YouTube FAQ or Google search would be beneficial? *shrug*
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