A. Add nitrogen. You are correct in being concerned that the compost pile is not getting very warm. Warmth is an indication that the process is working-- the bacteria are breaking down the contents of the pile. When compost is begun, the temperature can rise to 120-160 degrees within the first couple of days, with cooling thereafter. The higher temperatures can kill weeds so that they will not germinate.
The compost pile must have an appropriate mix of carbonaceous material, like dry leaves, and nitrogenous material, like manure, green grass clippings, kitchen scraps, or ammonium nitrate.
The best way to determine that you have adequate nitrogen is to check the temperature of your compost pile for the first three days. If the temperature does not rise, add nitrogen. Be sure that there is also adequate water.