List item that are useable anytime
List item that are useable on field
List item that are useable during battle
List event/important item
Sort item alphabetically by name
Display information about the selected item
Discard selected item

You can use item by simply clicking, or use keypad to select item you want use and press center button. If item name is grayed out, that means you can't use it (disabled).

KEYPAD NAVIGATION

Keypad Description
Up, Down Move focus
Center Click focused button
A Bring up Ability Screen
S Bring up Status Screen
W Bring up Weapon Screen
Q Cancel