Need Help With Social Marketing

My site is: http://www.bigearthexplorers.com/

I would like to add the “Social Marketing” to an image/button so that when someone clicks, for example the “Try for Free” button on my main page, the plugin pops up.

Also, can I make the popup wider? Once they share the page, I’m giving them a form (MailChimp) to fill out instead of a coupon code and the way the page is now, the form gets cut off.

I left the Social Marketing box in my site to show you what I mean but ideally I’d like the box to disappear and just have the option to click the “Try for Free” button

Make sense?

Thanks for your help!