There's an issue with importing the Cover photo that's a problem with EasySocial 1.2.7. Please see
this post
which has more information about how to get a patch from StackIdeas.
As for the white page, please go to the Joomla Global Config area and set Error Reporting to 'Maximum'. Let us know what error message appears and we should be able to help get you going.
Also, with EasySocial 1.2+, you need to be using JFBConnect 6.0.4 as there have been multiple fixes in JFBConnect for lots of changes that EasySocial implemented in 1.2.
Thanks,
Alex