Type in your comment in the Add a comment… interface, which is below the post. Then, click the green circle button with a paper plane icon to submit your comment.
​
​

Unless comments are closed, anyone who can see the post can also comment the post.
​
The user who made the post has the right to close the comments for the post.
School admins can also close comments for any post.
​
If the comments are closed, the post states, “Commenting is closed for this post.”