Sleek Photo sidebar not showing up

Hi,

I am updating my portfolio site with Sleek Photo. I want to add a contact form in the right sidebar. I've installed the plug in, but when I go to the Widgets page to drag it into the sidebar, there is no sidebar for me to drag it into. I do see the footer widgets.

I've used the Theme > Customize page to set a left content column.

I feel like I'm missing something really obvious, but I simply can't figure out how to make the sidebar show up either in the admin ui or on the site.

Any help will be much appreciated! Thanks in advance.