I have a Comfortmaker Furnace (approximately 1998/99) and the fan will not turn on allow the furnace to heat. When I turn on the furnace up past the room temperature the furnace ignites as it should. Once I turn the temperature down below room temperature there is a faint buzzing noise. After reading another posted question and answer I think it might be my fuse at the blower motor. My question is where is the fuse located? And how can I get to it..

There is no fuse just for the blower motor. Chances are either your capacitor is dead/weak or the blower motor itself has failed. There is usually a 3 or 5 amp fuse on the circuit board but if that were blown then nothing on your furnace would operate.

Ok thanks….but I should add one more piece to the problem….I have my ventilation system cleaned and the cleaning man knocked lose the brown park wire from the furnace control module. He reattached as soon as he noticed it.. My question now is could this have done some damage. The furnace was switched off at the kill switch for the unit during the whole time.

No. As long as he did attach the wire to the proper terminal then it will not cause any damage.

I also have a capacitor question; how does it realate to the furnace operation

The cap doesn't relate to the entire furnace operation directly. The unit will start up and ignite normally but with the blower motor not operating then your furnace will eventually go off on the high limit.
Honestly, if the cap is bad and you have some mechanical aptitude then you can replace for a few dollars... but if it is the motor then it will be more in-depth.