Keep on sliding around the planks until you can tilt the trough all the way. If you still can't figure it out then here is how.
P.S The next part contains spoilers!
First, slide the bottom horizontal plank as far left as it will go.
Now, slide the middle vertical plank as far down as it will go.
Now, slide the top horizontal plank as far to the right as it will go.
Now slide the middle vertical plank back up as far as it will go.
Now, slide the bottem horizontal plank as far right as it will go.
Now, slide the left verticl plank down as far as it will go.
Now tilt the trough as far as it will go.
complete the colour sequence then go to the mine shack get the map and read it go threw herberts footprints and go and look at it follow objects
on your map
in the mine shack
Where it is in normal club penguin
mine shack
at the mine shack
go to the mine shack , then click on the metal plank on the right on the mine shack building, (by the way its not in the mine its on the outside.. lol)
by going in
look on the map dummys
Next to the mine shack
mine shack
mine shack cave