The element and class will show up if you inspect it – target it that way. I didn’t want to fill in your lengthy form, but something like the below inserted into the sites main css stylesheet would work for my installation. You may have to set !important to the rule if the plugins css stylesheet is being loaded after your main site css file.
label[class=”ebd_input”] {
text-transform:capitalize;
}
Have you checked under Settings / Email before Download ?