To enter the brushed farm, you need a brush.
You have to follow the exact procedure below to use it.
Approve usage of both Blue and Brush. Approving blue is to buy the brush, and approving Brush is to use it at the farm
Buy the BRUSH you need. Remember, you cannot sell BRUSH since it's not listed on PCS. Brushshop burns all the paid $BLUE automatically so there's no refund once you buy them. You need 1 BRUSH / 1 deposit action on GREEN's brushed farm. From the next layer, you'll need 1 BRUSH / opening 1 pool without limits on depositing again.
Now you are ready to stake on brushed farm.