Can't change icons in KDE menu?

Everyone
I moved from Gentoo to NixOS about 3 weeks ago and I love it.
However, I am struggling with a very simple task: Changin icons in KDE Menu

For every single app that I tried to change the icon I got the following error:

Could not save properties due to insufficient write access to:
‘/home/marcelb/.local/share/applications/firefox.desktop’.

Example: OnedriveGUI → I traced the shortcut OnedriveGUI.desktop and it is symlinked to the store and it is owned by the root

[marcelb@Trico:~/.local/share/applications]$ ls -al
total 28
… …
lrwxrwxrwx 1 marcelb users 100 Feb 1 19:01 OneDriveGUI.desktop → /nix/store/4nhgfx5v3ldglwjgvhjrahzzbiryn5v4-onedrivegui-1.0.3/share/applications/OneDriveGUI.desktop

Same with any other app

Ideas???

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