Oh, you beat Ursula the first time, or the second time. You have to beat her twice you know.
If you haven't beaten her the second time, press start and go to your Ability column. "Go to Shared Abilites and equip the mermaid kick.". Then exit all the back to the strong winded place, you know, the place after Sunken Ship, forgot what it was called, lol.
There is a hole right one the other side, rapidly tap O and go to that hole. Defeat Ursula.
If you already did that, then from King Triton's place, head to Ariel's grotto and stand in front of the blue triton thingy, and there you go.
vvv credit to .Impact.
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