You can enter a comment on any post. The procedure for adding a comment is identical to how you create a post. The visibility settings of the post you are commenting apply. You cannot change the visibility of a comment.

1. Tap the Enter a comment input field.

The input field opens. The on-screen keyboard opens.

2. Enter a comment.

3. Tap the Create button to finalize your comment.

Your comment is shown in the feed under the corresponding post.