Activating this trainer:
Press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.
NumPad1: Infinite Health
NumPad2: Infinite SP
NumPad3: Change Skill Points By 25
NumPad4: Change Selected Item Quantity By 5
NumPad5: Change Selected Item ID By 1
NumPad6: Change Col By 5000
NumPad7: Freeze Playtime
NumPad8: No Skill Cooldown
NumPad9: Maximum Skill Level
NumPad0: Change EXP By 500
Selected Item: ID
Selected Item: Type
Selected Item: Quantity
Skill Points: Open your skill menu first.
Selected Item: Open your inventory and selected the item. After pressing a hotkey or using the editor switch to another tab and back to see it has changed.
Col / Level / EXP: Open the ingame menu where your col etc. is shown first.
Maximum Skill Level: Open your skill menu first. While active scroll through all skill trees and the skill levels will be maximized.
Unlock more trainer options including updates from here - Sword Art Online Trainer