For creating fields in Community Builder, that's something their own documentation would explain the best and is outside of our support area. For importing information from Facebook though, we only support text-type fields (text or textbox), date, and URL fields. Select fields (checkboxes, dropdowns, radio, etc) won't work because there's no guarantee that the options you give would be returned from Facebook.
We'll have to look into why the Error Check is returning that error. When I go to your page though, I get a big warning that the SSL certificate isn't valid. Our system is likely failing to retrieve the page because it looks fishy. Other users likely won't access your site like that either.
Hope that helps get you started,
Alex