@manfredk:
1. To change the header image below the secondary menu, you need to upgrade to Catch Kathmandu Pro version. Where you will get option to change “Featured Header Image Position” to “Before Menu or After Menu or Before Header or After Top Sidebar from “Appearance => Theme Options => Featured Image Options”
So, the easy option is to simply upgrade to pro version. But if you know the coding then you can build the child theme http://catchthemes.com/blog/create-child-theme-wordpress/ and then change the hook potions from your child theme functions.php file. This is complicated way.