To change the icon for a button right click on the button. Click on Configure Toolbar. In the window on the right side click on the icon you want to change then at the bottom of the window click on Change Icon. A list of icons will open and you can change the icon to anything on the list.
That's the only way I know how to change an icon. I bet if you asked at the Ubuntu forum as a Kubuntu user someone would know how to do it. I know Kubuntu uses KDE4.x now, but it used to use KDE3.x It's worth a try.
I think that icon is taken from whatever icon is used for the directory you have Konqueror opened to. I'm looking at Konqueror (sorry, but from another distro right now, Mepis), and I have have different icons for certain directories. When I change to one of those directories, the icon at the top of Konqueror also changes to the one for whatever folder I'm in.
Assuming this is the same for Mint, and hoping I explained this clearly. If you have no special icons for any of your directories, then I think all you should see there will be the default icon used for your directories.
Hi MALsPa, yes, that's exactly how it behaves. Instead, I would like the icon to be just that: the Konqueror icon, not a folder, not the desktop icon, not a disk icon... I'm pretty sure there's no way to obtain that, though, since no one (neither here nor in any other forum) had any idea. Thanks anyway