I also think this is a bit of an oversight as the info on how to do this is not included in the manual? One other aspect that also confused me and sent me searching the forums is the inclusion of the secondary 2x resolution logos for use on high DPI displays such as phones. Took me a while to figure out why my logo was showing ok on my PC but was showing default logo on my iPhone.
Can I suggest to Flynax developers that you update your manual to include this info to save your customers time and confusion, the basic initial install instructions should also be in the manual in my opinion.