I cannot edit any of my pages neither article of my worpress website.
I am using the theme Endanger ProVersion : pro 1.0
When editing any item with cornerstone (page or post);
Adding an element with cornerstone
The element is added to the footer rather than to the page or post.
I have logged in to your site and I was able to create a page using Cornerstone.
Please see the secure note.
When editing the page in Cornerstone, you are not seeing the preview because the theme itself has a JS error. This error prevents Cornerstone preview from working. You may be able to edit the page using the skeleton mode for faster response and easy access of the elements on the preview area while there is a JS error and that the preview is not working.
I made another investigation related to the JS error. I discovered that the theme is using NivoSlider. The script that loads the slider is non existent.
You will need to ask assistance from the creators of theme and make sure that you are using the latest version because the JS error is affecting the whole site even the 404 page, a basic WP page, which is not and will not use Cornerstone page builder.