This option allows you input passwords for certain location, you are not required to read the Al Bhed clues during the game to use them.
GODHAND
Input GODHAND in caps, this should take you to Mushroom Rock (Valley). Here you will find Rikku's legendary weapon, remember you will need the Celestial Mirror. You will find the first clue to the password in the ruins at the western end of the Mi'ihen Highroad - South End section. The next clue is on the rocky outcrop in the North of the Calm lands, where you will also discovered how far you still have to go to find the next clue. After three more clues, you will find the password lying on the ground.
Victorious
This password opens a secret location at the Ancient Road of Besaid. Climb up the tree branch to find Rikku's Victorious, which nullifies three elemental attacks (Lightning, Fire and Ice). You will have to combine the Al Bhed inscriptions from Killka Woods and Sanubia Desert.
Murasame
This password opens a secret location at the Ancient Road of Besaid. Cross the platform to find Auron's Murasame, which has the one MP cost ability. Take a look at the pillars in the Submerged Ruins to find the first clue, which will take you to a lightning conductor tower in the northern Thunder Plains. You'll find the password to the left, attachached to the fourth pillar, the one next to the save Sphere.