Hear me out -- this seems very simple....and I agree it should be, but it's just not working!
I created a new list. When to sign up forms. Went to embbed forms. Found the form action code and took only the right element from the box, added it to my store and added the "http:" in front of the double slashes.
Have tried this four times. I deleted lists and restarted. Cleared my cache and cookies. I waited at least 15 mins in between attempts. Nothing ever registers over to mailchimp, because i never get the email to double confrim and opt in.