Upfront not working correctly for me

Hi,

I just recently wrote about having trouble accessing the Upfront feature on a theme. I think I have figured it out unless there is something that I need to upload to the site.

However, when I am clicking the elements in the visual editor, it is just going blurry and not actually allowing me to make any changes to any elements, add media or anything.

Please let me know how I can start using this editor. Thank you!