If you're cooking "Minute Rice" you don't need a rice cooker ... just a saucepan - just follow the instructions on the box and replace the water with the broth of your choice. If I remember right - that just takes bringing the water/broth to a boil, add rice and stir, bring back to a boil, put on lid, remove from heat, wait 5 minutes, fluff with fork.
If you want to make a pillaf with sauteed onions, mushrooms, peas, or other such stuff - saute the vegetables first in a little oil/fat - then add the liquid - and follow the instructions as above for "Minute Rice".
Now, if you want to make "regular" rice - just follow the instructionas that came with your cooker ... and replace the water with stock.