How to find a line and put a comment symbol next to it, and then do the same, but remove this comment?

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Mika Slepinin2016-11-21 17:27:48

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Mika Slepinin, 2016-11-21 17:27:48

Good afternoon!
How to find a string, by pattern, and put a comment symbol ("#") next to it, without replacing the whole line? And then do the same, but only remove this comment, again without replacing the entire line?

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