Instructions
Move your character selection cursor over the character that you want to turn into a Chemist. Press the "Triangle" button, highlight the "Job" option and press the "X" button.
Highlight the "Chemist" job class and press the "X" button to change the character's job to Chemist.
Move your character selection cursor over the Chemist character and press the "X" button to select the character. Highlight the "Items" option and press the "X" button.
Highlight the "Ether" or "Elixir" item and press the "X" button to select the item. Ethers only restore a character's magic points, while Elixirs restore magic points and hit points.
Move your character selection cursor over the character whose magic points you want to restore. Press the "X" button to use the item on that character and restore his magic points.