To set your header go to CMSMasters admin panel: Goldenway/Styling Options/Header, Logo & Favicon.

Also you can set logo and navigation menu positions.
In this section (Header, Logo & Favicon) you can also set logo and favicon – just check “Display Logo”:

and upload your image to be shown as logo, then check “Show” for favicon

It can be any of these formats: .png, .jpg, .gif, .bmp. But make sure your file is no bigger than 2 Mb. WordPress doesn’t allow uploading images bigger than 2 Mb.