Editor Not Loading

We recently updated our theme to Bard and tried to activate its recommended simple social and mailpoet plugins. Now we cannot access the editor at all; it simply shows a white screen whenever we log in (be it via the /wp-login or /wp-admin), and the favicon is “jh” rather than the wordpress one. Any ideas? We’re a small student society, so we don’t have FTP.

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