How do I cook rice in a steamer? I'd like to cook rice in my steamer, if possible. It comes with instructions for a bunch of food types, but doesn't mention anything for rice.

The bottom of the steamer looks like this:


I also have two of these to put on top of the previous compartment:


I usually get boil-in-bag rice and cook the rice in a pot on the stove, so I'm not really sure how to cook the rice with a steamer.
It is probably best if you pre-soak the rice before cooking. How long you soak it for will depend strongly on the type of rice and your ambient temperature. Try an hour to begin with. Thai glutinous rice is traditionally steamed rather than boiled. Use a porous container for the rice so that excess water or condensates could drain out and not make the rice soggy. As a hack, you can wrap the pre-soak rice in a towel and put the bundle in the steamer, just be prepared to lose a fair amount to the towel deal with the sticky mess on it afterwards.