The amounts of unused credit are applied to reduce tax payable automatically. The Canada Revenue Agency (CRA) applies the available tuition amount carried forward every year to reduce your taxes to zero until it has all been used.
So if I understand your reply, the program won't let me apply the proper amount, I just trust CRA to do it for me. Then why did I purchase Turbo Tax if I must rely on CRA to calculate the proper amount of credit to use? Why not just fix the program.