First,click on #comments at the end of the post.(#-number of comments) example:
Then,write your comment here:
Then,if you are blogger user select Google(Blogger)but if you are not select Anonymous. (better select anonymous)If you want you can write your name,nickname at the end of the comment.
Then post comment.
You can see your or somebody else comment until I publish it or maybe answer(if it is a question)
Hope this help and hope you comment more...