5: Switch on rice-cooker (the red "cooking" light should be on), and cover.
6: After 15 minutes you should hear a "click" and the "keep warn" light will come on.
7: Your rice is cooked.
8: Stir with a plastic spoon to prevent rice from sticking, and add a knob of butter if you wish.
9: If you don't want to serve rice straight away, leave covered but with rice-cooker switched off to prevent rice from drying out.
Remarks
Rice-cooker are usually sold with a measuring jug. If you use it always remember the correct proportion is 1.5 parts water to 1 part rice. For tastier rice you can use chicken stock instead of water, or add a little chicken or meat cooking juice, or add a chicken stock cube to the water.