The embedded comment form is more convenient for your readers because they can use it to post a comment immediately, without clicking over to a different page. It also looks better, since it matches your blog’s style and colors.
If you’re logged in to Blogger with your Google Account, you can also subscribe to comments via email by clicking the “Subscribe” link. Unlike with the full page comment form, you don’t need to post a comment to subscribe.
Settings > Comments page and look for the Comment Form Placement setting. Change it to Embedded below post, save your settings, and go check out a post to see the new form in action.
The embedded comment form works on both Classic and Layouts templates, though if you’re using a heavily-customized Layouts template you may need to reset your widget templates before the embedded comment form will appear.
We think that the embedded comment form is a big improvement, so we’ve made it the default setting for all new blogs.