if running KWrite is a prob
at a cli type
chown username:usergroup name $pathto/KWrite
chmod u+x $pathto/KWrite
then all should be done
Else if your trying to edit stuff in places like "/etc" etc then you'll have to either run as root, or make your box insecure by doing the above on the files you want to edit. Or on the directories you want to write to.
If you could provide more info as to which files your editing that would be of help
or you could chmod u+s $pathto/KWrite and set it suid so it runs as suid root, meaning you can edit stuff without su'ing first