MailChimp Newsletter Sidebox

[ParseRaider]

I get an unsecure site error when using mailchimp and Mozilla browser from zencart where I use this program.

On my main site By directing my site to use http instead of https for the mail list I avoid the blocked padlock icon and warning BUT get a small popup saying site is unsecure.

I have SSL certificate on site but MailChimp does not support SSL according to many emails between myself and mailchimp support today.

Why MailCHimp would not work with SSL is really bothering me as you would think they would want the maximum security for me and my customers.

Is there anything I can do to get rid of the un secure site warning?

I use 1.5.4 version

Main site link is here under mailing list popup. This uses the supplied small url that MailCHimp supplies:
https://ultimatepicklejar.com/ [mail links only work from index page here as I have not changed the rest of the page links to reflect the new signup form]

https://www.ultimatepicklejar.com/zen-cart6/ this is the store site where I use the MailCHimp Newsletter Sidebox. [ which I can not also set the width to work correctly]