How do i change the headlight bulb in my 89 C1500?

i unscrewed the front piece but it seems that the assembly is one piece i tried turnin it it doent want to turn i dont wanna brake itHow do i change the headlight bulb in my 89 C1500?You will need to gain access from the rear on this model.Whatever is behind that side bulb will need to be removed to gain access to the bulb.Best of luck.