How to turn on comments in Youtube

To turn on comments for your own YouTube videos, follow these steps:

Go to your YouTube Studio dashboard.
Click on “Videos” from the left-hand menu.
Find the video you want to enable comments on and click on the title.
Click on the “Comments” tab.
Make sure the toggle switch next to “Allow Comments” is set to the on position (blue).
If you want to review comments before they are published, you can also turn on the “Hold potentially inappropriate comments for review” toggle switch.

Note that if your video is marked as made for kids, comments will be automatically turned off, as per YouTube’s policies.