Can't remove group checkboxes?

I don’t know if I’m just not seeing it or what, but I’m trying to create the lightbox signup form and there is no way for me to remove the group1 and group2 checkboxes. It only gives me options to edit the text, size, weight, etc. and the style of the checkboxes (light or dark). There is no option to remove or delete them completely.

Is there a way to do this that I’m just not seeing? Thanks

https://wordpress.org/plugins/chimpmate/