To enter the codes press CTRL+SHIFT+Z to bring up a cheat menu.  Then
type in the code and press ENTER.

ask a glass of water      Teleport to location of beginning of chapter
some call me tim          Kill all enemies during combat
gotta have magic          Give Aren all spells
why am I so dull          Max out skills
man does my leg hurt      Heal party
supermarket for the rich  Access good items