slide-in does not work on my site

*I do not select my site in the menu, because when i did it (with any site) the menu does not show any plugin, so i can't post my question.
The site por this case is http://www.portuguesparaelmundial.com

I have installed slide-in but it does not work on my site.

I'm using "enfold" theme with avira framework, maybe this theme does not let slide in work properly, but if there is any way to solve it I'm very interested