We are trying to get our pilot to light on a Miller gas furnace for a mobile home... where exactly is the pilot light located?

These are tricky... the 1/4" tube leaving the gas control leads to the pilot burner. If you have a flexible gas connector, the burner assembly can be withdrawn to access/view. Otherwise, start practicing with that match holder... pic of common pilot burner, yours may vary.

There is a small spring loaded door on pilot light models of Millers that are used for mobile homes. This will get you access to the pilot. It is a long reach.