You don't.
Zelda makes no apperace in Phantom Hourglass, exept under the name of 'tetra', the person your are aimed at saving.
Defeat Belum and and save Tetra
You must travel into the fog and use the spirits' power to locate the ship and climb on to save Tetra.
If you're referring to Phantom Hourglass, just complete the game and she will be restored.
Go to zauzs island (exactly north of the isle of gust EXACTLY NORTH)
In "The Legend of Zelda: Phantom Hourglass," the third medal to save Tetra is held by the character known as the Ocean King. He is located in the Temple of the Ocean King, where you must complete various challenges to obtain it. After defeating the enemies and solving puzzles, Link can retrieve the medal to help rescue Tetra from captivity.
Zelda does not appear in 2 games: Link's Awakening (DX) and Phantom Hourglass.In Phantom Hourglass, however Tetra is the alter ego of Princess Zelda, so you can still say that Princess Zelda did appear in this game, just in the form of Tetra. In Link's Awakening (DX) Zelda isn't even mentioned once.
Now, do you mean towards the end of the game? If so, drive your boat toward it to board. then comes the boss battle. If you mean when you first find Tetra, go back to Oshus... then take it from there...
actually, from what I now from the game, tetra is, infact, Zelda. Its one of here disguises
Zelda, Princess of Hyrule (usually shortened to Princess Zelda) rules the Kingdom of Hyrule, and has appeared in every game to date with the exception of Phantom Hourglass, however Tetra, who appears in the game instead, is the alter ego of Princess Zelda. Zelda will usually be captured by Ganon (or Ganondorf, depending on the game) or another villain, whom Link must save from Evil's clutches. Zelda also has her own personal theme, "Zelda's lullaby".
you can ether start over or beat it again or just do whatever you want after the cut outs there is another video of what happends to link, tetra, and linebeck
I'm pretty sure she's Twelve. Zelda is always the same age as Link,and she is Zelda so...