I'm trying to activate Slide In on my site, I'm using

I'm trying to activate Slide In on my site, I'm using the Flatco theme. I can't get it to appear at all. I've tried a Mailchimp subscription form, then just a simple text message to make sure it wasn't a MailChimp issue.

I've deleted and reinstalled, cleared my cache, and still nothing. Right now I have a global slide in that appears after 5 seconds to try and test. Haven't been able to make it appear.