Plugin is the easiest way to connect your blog to Facebook .I tried to put Facebook comments many times following tutorials from fellow bloggers but it was a failure until I gave up.Until I found out the plugin .I tried it again, followed the steps and was happy about it. Here is the simple step:
1.) Put your blog's URL.
2.) Click the "Get code", copy the first plugin code.
3.) Go to template, Edit HTML,expand widget and insert the first plugin right after the opening < body > tag.
4.) Save Template.
5.) Copy the second plugin code .Go to your blog layout/design, add gadget ,click HTML, paste the code and place it under your blog posts or wherever you want it to appear.
6.) Save arrangement
7.) View blog URL and type first FB comment on your site.