The upload directory is not writable: uploads won't work in your form.
Set the permission to 755 on the directory
http://www.birminghamsalvationarmy.org/wp-content/plugins/contactformgenerator/forms/uploads on your server to solve this problem.
Set the permission to 777 if it does not work otherwise. If your website is installed on a Windows based server, you must make the directory writable.