To add more space above the Comment box, add the following tag to your template:
.jfbccomments {margin-top: 15px; }You can add that to your own template's CSS file, which is probably the best location. You can also add it to the JFBConnect CSS file at /components/com_jfbconnect/assets/jfbconnect.css . However, that file will be overridden when you upgrade, so you'd have to re-make the change, which isn't ideal.
Hope that helps!
Alex