In order to be able to add the brand header, you need to choose the brands tab located in the settings section as a user who has admin authorization. You need to choose the Top/Bottom information section on the top after clicking the pen icon on the right of the brand you wish to change among the brands you will see in this section. Then, you can click on the “Insert image” choice and add your image. The images’ formats should be jpeg, tiff, png, etc. PDF and similar formats are not suitable for this section.