Press "Get" button to add palette to your local Palettes list
In order for the added palettes to appear in the list, you may need to reload the game page
Palettes list can opened by pressing on three dots on right-most color bar (or by F2 key) when in room
Orange to be the darkest
Brown to be the darkest
Pink to be the darkest
Blue to be the darkest
Yellow to be the darkest
Green to be the darkest
Red to be the darkest
White to be the darkest