If you wish to leave a comment, sign in to your profile. When you come across an update you wish to comment on, click in the comment box and type your response. Click on 'post' when you are finished.
To attach a photo to your comment click on the orange camera and choose a photo from your computer or mobile device. You will have to select a category and then type your comment before clicking on 'post' when you are finished.
To attach a link to your comment click on the orange link icon below the comment box, attach your link, then type your comment and click on 'post update' when you are finished.