you need to have the wind waker
Note: you get it after defeting the boss at the top of the mountain where the dragon is
go to the back side of the island.
there will be a small floating island with what looks like tombstones and 1 is broken.
the one that is not broken walk up to it and read it (Push "A"
Then do the same notes on the wind waker
Hope i helped!!!!,
Hi
Ya know, you don't have to learn the wind's requim after you beat dragon roost cavern. You can learn it before you do anything at dragon roost island because you actually get the wind waker right when you arive at dragon roost island.