Use a text editor such as notepad to edit the "keybinds.ini" file in the "game" directory. Add the following lines to the file:

KC_F1 = player:set(_N("Health"),"1000")
KC_F2 = player:set(_N("Mana"),"1000")
KC_F3 = player:set(_N("DeathEnergy"),"1000")
KC_F4 = player:set(_N("Money"),"1000000")
KC_F5 = player:set(_N("LearningPoints"),"1000")
KC_F6 = player:set(_N("AttributePoints"),"1000")

Then, press one of the following keys during game play to activate the corresponding cheat function.

Effect -Key
Set Health to 1,000 - [F1]
Set Mana to 1,000 - [F2]
Set Death Energy to 1,000 - [F3]
Set Money to 1 million - [F4]
Set Learning Points to 1,000 - [F5]
Set Attribute Points to 1,000 - [F6]