There are a few ways to view comments on YouTube videos on an iPhone. The first way is to open the YouTube app and sign in with your account. Then, you can click on the three lines in the top left corner of the main screen and select “Comments.” This will open a comment box that looks like this: If you want to leave a comment, just type your thoughts into the text field below and hit enter. If you’re not sure how to type comments, check out our guide on how to write good ones. If you want to share a video with someone else, just hit “Share” at the bottom of the comment box and they’ll be able to see it right away.