In leap 42.2 with kde when in the preferences of the kde -> color system, I try to modify the white background color for the breeze theme, when I accept I get a message saying that I do not have permissions to modify that theme and if I execute This as root would apply the changes logically to the root user and is not what I want.
I do not know if it is a leap bug or a problem with restricting opensuse permissions but, this does not make sense because opensuse can not limit me to modify a graphic aspect that kde gives me from its own control panel and is something that only affects To my user.
Those are the ones you can edit via the widget or manually. For all others you have to create copies. Actually the wizard asks you for a name to save your edits to. Just name it Breeze.mine or something. Note how there will appear a file named Breeze.mine in the dirs above.
I would strongly advise against editing system schemes because they might get overwritten on update.
When you make changes, then attempt to save it, change the name to “Breeze-modified” or something like that. The changed theme will be saved in your ~/.local/share/color-themes/