Activating this trainer

If not state otherwise below, press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.

Trainer Options

# Player 
     NumPad1: Unlimited Health
     NumPad2: Unlimited Stamina
     NumPad3: No Hunger
     NumPad4: No Thirst

# Gameplay 
     NumPad5: Game Speed

Editor Options

# Player Stats 
     HP
     Max HP
     Stamina
     Max Stamina
     Hunger
     Max Hunger
     Thirst
     Max Thirst
     Current Weight
     Max Weight
     Weight Cap
     Damage
     Armor
     Woodcutting Damage
     Mining Damage
     Attack Range

# Player Progression 
     Level
     Current XP
     Next XP
     Skill Points
     Strength
     Endurance
     Vitality

# Inventory Slot 1 
     Amount of Item
     Durability of Item
     Max Amount of Item in Stack

Notes

Amount of Item:
Inventory Slot 1 is the upper left most slot in the inventory.  Put an item there and you will see the values fill in.