Add customized footer

I’m trying to add a customized footer to my site (www.createdbyconstance.com) that shows 3 columns: Recent Posts, About, and Contact. I’ve read that the Customizr theme has a way to do this, but I’ve been unable to find it. Can anyone help me out here? When I click to edit the theme, the only footer option I see is to set so the “back to top” button appears or not.

Is this something I need to do in the code?