I looked at the forum found different postings, like:
https://www.boonex.com/forums/topic/Custom-link-header-status-bar.htm
https://www.boonex.com/forums/topic/how-to-change-icons.htm
https://www.boonex.com/forums/topic/Icon-replace-text-for-top-menu.htm
I did not try the solution with the changing of the key, because i would like to know how it works with the setting in the builders / navigation menu element. With the picture and icon field. And how to use one of the font awesome icons. Thank you