Form not working

ON this site:
http://kewstudio.org/classes-workshops-tuition/virtual-exhibition/

The form doesnt work,

I had this error on the Media Manage UGC page:

Warning: Cannot modify header information – headers already sent by (output started at /var/sites/k/kewstudio.org/public_html/wp-admin/includes/template.php:1935) in /var/sites/k/kewstudio.org/public_html/wp-content/themes/ifeature/cyberchimps/functions.php on line 1463

Thanks!

https://wordpress.org/plugins/frontend-uploader/