If your site used a global header which allows for more customisation than the standard WordPress header you can follow this tutorial if you want to make changes.
In the Dashboard go to [Divi] then [Theme Builder]
Click the Pencil icon on the “Global Header” Module on the “Default Website Template”. Changing this will cascade the change to all other templates using the global update.
Click on the item you want to change to reveal the Divi navigation.
Click on the Cog to open the settings and make any changes you want.
Once you have made your changes click on the Cross in the top right corner of the screen.
If prompted click [Save & Exit]
The same instructions apply to Global Footers or any other global sections.