How to Make a Comment on Facebookby Morgan O'Connor
Facebook encourages interaction between you and your friends, enabling open comments on notes, status updates, photos, posts on walls and more. Your friends, however, have the option of refusing to allow comments on some of their activity. If you can't comment on a particular friend's status update or other event, this is probably why.
Sign in to your Facebook account. Navigate to the item on which you wish to leave a comment.
Click the blue "Comment" link that typically appears slightly below the photo, comment, note or other item on which you wish to leave a comment. In some cases, such as status updates, you don't need to click this link because a "Write a comment" field appears automatically. Clicking the "Comment" link places your cursor into the appropriate field.
Type the comment that you wish to leave. Then press "Enter" to post your comment.