How to Add Content Above Sidebar

I am trying to add a block of clickable photos above my sidebar, similar to a heading. I can’t quite figure out how to do it. I have looked around in my Widgets with no luck.

barbellsandblessings.com is the site, if you would like to look to see what I mean. I’m trying to get the four photos above where the sidebar begins.

I will add, I’m new to WP and am not too great with CSS or HTML but am learning.

Any help would be appreciated. Thank you!