Thanks for upgrading to pro version. Here is the step to add banner image just below the menu heade areas.
First go to dashboard -> appearance -> widgets -> on the right you will get widgets areas called Banner , there you need to drag and drop text widgets
Then on text widgets content area you need to add this image tag:
Note: After uploading the required banner image via media gallery then for the image url
Go to dashboard -> media -> click on the required image -> on the right most you will URL field then copy whole link and paste on to src property.
Let us know if you got any problems on this, we will be more than glad to assist you.