If you have seen the default comment form of a Wordpress blog, then you may feel envious and want one for your Blogger hosted blog. Fortunately, the Blogger's own version of a comment form can be easily enabled through Blogger in Draft. Here's how:
1. Simply login HERE using your own Blogger username and password.
2. Go to Settings --> Comments, then look for "Comment form placement" settings.
3. Simply choose "Embedded below post" option (as shown below) to enable the comment form:
4. Save the changes to your settings and enjoy!
For troubleshooting and for other issues, you may visit this good tutorial by Amanda of Blogger Buster HERE.
How to Add a Comment Form Below a Blogger Blog Post
