How I can change color of description text in appmenu?

I want set white color, but I tried change colors file in folder with theme, but its not help me
Sorry for bad eng

Plasma 5 Theming guide

Development/Tutorials/Plasma5: https://techbase.kde.org/Development/Tutorials/Plasma5
--> ThemeDetails: https://techbase.kde.org/Development/Tu ... emeDetails
-----> Colors: https://techbase.kde.org/Development/Tu ... ils#Colors

Sometimes the Plasma is using the theme from the cache: ~/.cache/. In those cases this:

Shut the plasmashell down:

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kquitapp5 plasmashell

Remove the plasma cache files from the ~/.cache/.
Start the plasmashell (KRunner):

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plasmashell

is helping at here.


Alternative - Edit the plasmoid

If everything else fails there is an option to edit the plasma qml script ( https://en.wikipedia.org/wiki/QML ) .

Example with the Kickoff:

With the Arch Linux the Kickoff/plasma-desktop 5.6.4 is installing: /usr/share/plasma/plasmoids/org.kde.plasma.kickoff/contents/ui/KickoffItem.qml

The KickoffItem.qml has 'id: titleElement' - adding there color:

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            text: model.display
            color:"green"
            elide: Text.ElideRight


There is also 'id: subTitleElement' - disabling the text opacity and adding color:

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            text: model.description
            //opacity: isCurrent ? 0.6 : 0.3
            font.pointSize: theme.smallestFont.pointSize
            color:"red"
            elide: Text.ElideMiddle


Rebooting the plasmashell - and here the Kickoff has more color:

Full Image: http://i.imgur.com/Q21aWvR.png

Notes

- Plasma desktop updates will overwrite the edits of the KickoffItem.qml
- More of the qml colors: http://doc.qt.io/qt-5/qml-color.html