1981 Ford Bronco

I have a 1981, 351m, 200k, Ford Bronco. Awhile back I noticed the brake pedal getting soft, shortly after the brake light came on. When I checked the reservoir the front compartment was empty. I figured out I had a slow leak. I refilled the front reservoir and bled the back brakes. They have worked better then ever since then but now I can't figure out how to get the brake light off. Ya'll had told me to bleed the combination valve while holding in the pin on the front, but I don't know where to bleed the combination valve from? Any help would be great, thanks.