Comment 8 for bug 258861

Hi to all im new here and in Kubuntu 8.10 and excuse my english.
Ive just installed Kubuntu 8.10 and I came here from: kde bugs and it happened to me the same: I dragged a link to a linux blog to the desktop and I noticed that dont appear in the folder "Desktop", why? It has to drag to the Desktop field to that appear in Desktop folder?
Besides, as referred above, I just installed Firefox 3 (as Konqueror 4.13 dont show the plugin/function Archive web to save webs with pictures and dont play flash videos even flash plugin is installed) from Adept Manager and added a Firefox icon to the panel. When I restart my PC I get the error Fatal Error: Plasma Crash: (see attachment)
I read the solution: remove ~/.kde/share/config/plasma-appletsrc but I don't know how to type ~ and what it means, which folder I mean, and I dont know what is this file, what it do and Im afraid that what will happen if I delete it. I'll loose all the icons in the panel ? And what this only happened whith Firefox 3 and not with other icons? Is cause firefox 3 is from Ubuntu and the others are from Kubuntu ?
Please help me, Im new in Kubuntu 8.10, idont know how to do orders with keyboard in Linux (only DOS) and everytime I load KDE the same error appears and I can't use it.