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.
"It ain't what you don't know that gets you in trouble. It's what you know for sure that just ain't so." - Mark Twain