Upload the child theme as a new theme (Divi has to be activated before → please use the newest version of Divi – this child theme works with 5 and 6 columns).

After the child theme is uploaded, activate it. In the menu, you will see Divi DJ options. Once you clicked there, import the demo content.

This Child Theme works with a grey background. To amend this, please go to Appearance → Customize → General Settings → Backgorund

Please find other customization in Divi → Theme Options → Custom CSS

If you have further questions, contact me via → I will try to answer as soon as possible.