I've installed the Social Marketing plugin to use

I've installed the Social Marketing plugin to use as a content locker for a free bartending cheat sheet I provide on one of my sites.

Everything seemed to work perfectly until I tested each of the options and found that when you click on the FB icon to share, half the comment box is hidden below the bottom of the screen. And because the box is static, scrolling down doesn't reveal the Submit buttons.

I know that I can hit Command- on my Mac to decrease the screen size to show the buttons but most people don't know that.

You can see it on this page:
http://barsandbartending.com/free-bartender-cheat-sheet/

Once you get to the share part and click on FB, you should see what I mean.

How can I fix this issue?