If you are unable to find comment option or comments on Blogger blog (blogspot blog) or missing all comments of blogspot blog, you can view again all comments by turn ON comment option.
There is option to turn OFF and turn ON comment in Blogger. To turn ON comment option on blogger, you need to go to dashboard of blog, click on layout, click on “Edit” link of “blog post”. Tick the comment option and save the setting.
Now you can once again see all comments of the blogspot blog, and also other people will be able to comment in your blog.