How to Add a Comment to YouTube. Whether your company is involved in video production or you simply want to chime in on someone else's content, it's important to know how to properly post a ...

If you're looking for an old comment on YouTube you can easily find it in your comment history from desktop or in the mobile app.

The "Comments Search for YouTube" extension lets you quickly trawl through all of the comments on a given video or even an entire YouTube channel by searching for key terms.