Orlandox,
you can rename your channel. However, if the channel is also in the main list and you have enabled the second option in the menu, the channel will be renamed back to the name of the channel in the main list when the list is updated.
To find a suitable radio logo, the station must have ' - ' in its name.
The left of it is assumed to be the provider name, and the right of it is assumed to be the station name.
'Mixed Channels - ' will be ignored.
In your example, the name would now be 'POP fm - Finland'. So the provider would be 'POP fm'.
The path would therefore be '/media/hdd/HDF-Radio/hdfradio_logos/POP fm/POP fm.png',
or '/media/hdd/HDF-Radio/hdfradio_logos/POP fm/Finland.png'.
I might be able to expand this for the next version.
Names without ' - ' could also be accepted.
e.g. Station name: 'POP fm' (as before)
Path: '/media/hdd/HDF-Radio/hdfradio_logos/POP fm.png' (path without subfolder)