New Blog Templates Help - can't find blog ID or get it to work at all

I've been trying to get this plugin to work and for the life of me can not figure it out...

I keep getting this error (no matter which site I'm trying to template from):

"Whoops! The blog ID you posted is incorrect. You cannot template the main site. Please go back and try again. (Generated by New Blog Templates)"

Any help would be incredibly appreciated - thank you!