WEBSITE AND CONTENT HAS VANISHED

Hi Support,

Please can you assist me. My blog used to have the Divi 3.0 Theme installed and when I came across your upfront builder I thought I was going to be able to create a new blog layout and theme by drag and drop but everything has completely vanished after I installed the Issue Theme. I have clicked on customize but it just takes me to my home page and I do not see any options of modules etc that I am supposed to use to create my blog.

Am I doing something wrong?