How to make trainer work

[Sequar]

I just downloaded the trainer for Fable ii. I disabled my norton protection because it thinks there is a virus. I start the trainer and then start the game. I activate the trainer in the game and then hit a key , say numpad 3, and I hear that the function is enabled but now I don't know to actually do something. Numpad 3 is supposed to add 25 things but nothing appears to happen. I really feel stupid but how do I make this cheat work???