Recommended article before setting up: Engage: Page Targeting
The Social Slide In is a fantastic way to connect your visitors to your Facebook content. Makes a great use of your blog posts and other media oriented pages! To create this call to action, select the Social Slide In from the available list of CTAs.
To use this call to action:
Carefully copy the url shown in the CTA options. We'll be replacing a portion of this url.
Your url should look something like this:
https://www.facebook.com/plugins/page.php?href=https://www.facebook.com/AgentFireSites/&tabs=timeline&width=340&height=1200&small_header=false&adapt_container_width=true&hide_cover=false&show_facepile=true&appId
You will need to edit just the portion of this url that leads to your facebook site. Just remove the { } and add the link to your facebook page.
https://www.facebook.com/plugins/page.php?href={https://www.facebook.com/AgentFireSites}/&tabs=timeline&width=340&height=1200&small_header=false&adapt_container_width=true&hide_cover=false&show_facepile=true&appId
Paste your updated url in the CTA link.
Choose an appearance, condition and position (see: Editing Your CTAs)