Several weird things here (and maybe it's because I'm used to Sumo's Tools)
a) I don't understand why I have a form code to place on site for an exit intent offer. Shouldn't this be handled by the default script? Where would I place the form code then? It's for all pages.
b) You cannot alter any of the styling of the lightbox.
c) I changed the text for the button, but it wouldn't change from the "Subscribe" default.