Thank you so much for using our theme SuperMag.
You have to write some custom code for it. Create a child theme and change the header as your need.
If you can’t do, you can hire a customizer for it too. http://www.acmethemes.com/customization-request/
If you buy our premium product, we will provide the child theme free with the header customization.
Please check our premium product. http://www.acmethemes.com/themes/supermagpro/