Thumbnails / Featured Images and links not working!!

Hello! I really need your help please! ??

The featured Images (or Thumbnails) to my posts are not working anymore!
They just seem to be forever loading, but nothing happens. I can’t even click the images to follow the link to the posts!

This happened when I wanted to do a simple change in the functions.php (I read that tip on this forum, and now I know I made a grave mistake) a friend of mine could restore my webpage, but now the posts seem to be broken…

I would be very grateful if somebody could help me out fast T____T
thank you for your time.

The page I need help with: [log in to see the link]