Hello Karen,
Thanks for sharing the system info and the full screenshot. It looks like some other plugin is generating a JavaScript error which is causing the JavaScript in my addon to fail.
By console, I meant the JavaScript console in Google Chrome. You can read more about it at https://developer.chrome.com/devtools/docs/console
Basically you can open it with by going to the menu View -> Developer -> JavaScript Console.
Once you click that it will open up the JavaScript console at the bottom of your screen. Refresh your page and if there are any JavaScript errors then they will be displayed in the console.
Please take a screenshot of the console and send it to me.
If you find it difficult and if you are willing to give me access to your WordPress admin area then I can check it out myself.
If you decide to give me access, you can paste the credentials in your reply and select the “Set as Private reply” option, just above the submit button so that only both of us can view it.