Thanks for writing in! Regretfully we only have one sidebar to display in the theme. You can have either on the left or right of the page. If you do not have blog posts yet, you can make this possible by setting your site content layout to fullwidth in X > Theme Options > Layout and Design > Content Layout. And then create your by using the Cornerstone editor. In Cornerstone, you can insert 3 columns. The one of the left and right is for the sidebar while the middle column will contain your post contents.