Activating this trainer:
Press F1 at main menu.
Listen for 'Trainer Activated'.
Press desired hotkey. All hotkeys can be changed on the trainer.

Promo Options:
NumPad4: Change Transfer Budget By (Limited to +1 in promo!) 500000

Trainer Options:
NumPad1: Perfect Condition For Selected Player
NumPad2: Perfect Sharpness For Selected Player
NumPad3: Perfect Morale For Selected Player
NumPad4: Change Transfer Budget By (Limited to +1 in promo!) 500000
NumPad5: Change Wage Budget By 5000000

Editor Options:
Misc: Transfer Budget
Misc: Wage Budget

Notes:

Selected Player: Open the status screen of a player showing his skills and press hotkeys. Click on 'Squad' tab to see it has changed.

Wage / Transfer Budget: Open the finances screen and press hotkey or use editor. Switch to another screen and back to see it has changed.