[Koha] OpacNav html

I would like to place a hyperlinked image in the OpacNav but am struggling with a. where to store the image b. the html to place in the Opac preferences syspref Could someone please supply an example. Koha 3.8.3 on Debian using packages Thank you, Clint. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.