You can leave comments with articles that others have created, or respond to other comments.

Comment on an article

If comments are allowed, you will find an input box for comments underneath the article. Write your comment and click 'post comment'.

Reply to a comment

You can also reply to a comment, or reply to a comment reply. Go to the relevant  comment and click on the link 'reply' underneath it. This will open an input box.  Write your reply and click 'post comment'.