Comments are temporary notes left on a question or an answer. They can only be upvoted and flagged, but do not generate any reputation change. To earn this badge, you have to leave a total of 10 comments, each getting 5 or more upvotes. To leave a comment, simply click on the comment link below each post.
Please note, that, while you can always comment on your own posts and any part of your questions, commenting on other people's posts is a privilege you have to earn by getting more reputation.