Hmmm, you've put them in the right directory, right? I recall that for a start the icons go in a different directory to the items that they represent in the game.
I have just realised that these are 'png' format.... I dont have the app with me here but have you tried the 'gif' (or possibly 'jpg') format?
Got a download of a flameblade with me here now. The files are called:
flameblade-toward.gif
flameblade-item.gif
flameblade-floor.gif
flameblade-away.gif
After that it's down to playing about with "custom items" in the editor. I find it a bit awkward, to be honest, as there are two things going on...
1) you can create a custom item in the list, and use it 1 or more times as you build your dungeon
2) you can add an item to a game and then change it's properties to make it unique.
See the difference? I've used the custom item editor for ages, and still find that I've made mistakes.
There is an
editor guide available, in pdf format.
Corrections?