Nothing happens when I try to add conditions?

Deactivate all other plugins and try adding conditions again. If this fixes the problem, it was caused by another plugin*, and you should contact the developer and refer them to this page. In rare cases, themes have also been the cause. If the problem is not caused by incompatibility issues, open a ticket in the Support Forums.

(*) Technically, most often the problem is that a plugin loads an unneeded script on the sidebar editor screen, or that it registers an outdated version of a library that Content Aware Sidebars depends on (such as backbone.js or select2). This can lead to fatal errors in JavaScript. Plugin developers should follow best practices and only load scripts when they are needed.