I just recently got a. I just recently got a teleconverter lens for my canon s5 IS. I don't

Question

I just recently got a teleconverter lens for my canon s5 IS. I don't notice any appreciable difference between the 12X zoom and the teleconverter. The picture is slightly closer but not much. Also, I didn't notice ANY difference between setting the menu to teleconvter and when I didn't. I admit I'm a real novice when it comes to cameras. What am I missing or doing wrong?