I’ve taken a pic of how to post a comment in the blog. 

Click on ‘post comment’ under any post. Then type your comment. Then click where it says ‘google account.’ It will give you some options. Either post anonymously or click on ‘name/url.’ You can then add your name. Click on publish and it will work. I’ll have to moderate the comment but once have done that it will show up. :) 

Now you can enjoy commenting as much as you like!