I am new to Krita ,and love the app.
However, I change some settings commony accesed by the F5 key.
Krita now just paints grey and white patterns.


How can i revert these settings?

Which version of krita are you using and which operating system?
The F5 key opens the Brush Editor and with that all you can do is edit one brush at a time.

Can you post a link to a fullscreen screenshot (.png) showing this problem when you're painting with colour.

Does it happen with all brushes or just brushes that you've edited?

It happened with all the brush,but within the time frustrasted, i created a new krita document and deleted the old one.
Where are the krita configuration?.

https://docs.krita.org/en/KritaFAQ.html ... les-stored