I'm not sure i understand exactly what you want to do to be honest, but i'll take a chance:
i guess you want to copy a picture you found somewhere in the folder where the rest of the login screen pictures are found...and this folder is read-only for the simple user...
You should try to login as root from a konsole and cp the specified file to the respective folder...
If you're using KDE, that's probably somewhere in /opt/kde3/share/apps/kdm/pics (if i remember well...)
If it's something else you need, pls give some more info....
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