I don't want my hair to get darker, but first grey covered, how do I go about it?Updated 6 months ago

Please note that the initial hair color determines the final result. If you do not want to go darker, you should choose a shade that is 2 tones lighter than your starting hair color. If you choose a shade that matches your starting hair color, the hair that is still pigmented will become darker and the white hair will get the shade in a lighter reflection. 

For this reason, be careful not to dye all of your hair the same shade if your lengths are darker than your roots.