Slide In Plug In Not Working

So I had this plug in on Mom at Last and it worked for a little bit but then it kept bringing me to another page, instead of it being a slide in.

So I deleted it. I tried the Wordpress Pop Up Plug in from WPMU and it did not work. Then I tried the Slide in On http://www.mommyssippycup.com and it is not working. Then I tried it on http://www.theadoptionapp.com and it is not working. I tested it on my PC, My Mac and My Kindle Fire HD.

Can someone please explain to me why this plug in chooses not to work?

I want the slide in to work so it brings up my mail chimp newsletter.

Yes, I entered the API key for mailchimp and yes I made sure all settings were set.

Please someone fix the problem or let me know why this is not working like it should.