Easy.. NOT AT ALL

I have used free themes in WP and was able to edit the content with some practice. I started a new business and wanted to try a premium theme and your advertising drag and drop and useful demo content pricing sold me over beaver builder or Divi.. Well, I made the purchase and I have been trying for 2 hours to modify the demo I installed, even tried a different one. I can not find where to edit the premade content and the visual composer does not work at all.. I looked at your support forum FAQ with no answers to my issues.

Some help would be appreciated.