What exactly can’t be changed?
Provide temporary wp-admin access, so we can take a closer look.
If you want to edit header of the Home page, go to Theme Options > Header builder > Multiple headers > edit header for the Front page.
Here is a video about Multiple headers – https://youtu.be/BpeXfzNwkOc
One standard license is valid only for 1 project. Running multiple projects on a single license is a copyright violation.