This is the position that you will usually adopt after the class starts, once you have bowed to the instructor. It is also the starting position for the patterns, where you maintain this position until told to start the pattern (wait for it, wait for it, go [seejak]).
Place both feet shoulder width apart.
Keep your feet pointing forward so the effect is like being on tramlines, and bend your knees slightly. Your weight should be evenly distributed between your feet.
Hold your hands out as far as they go in front at shoulder height palm downs. Make a fist with the thumbs outside. Bend your elbows bring your hand towards your body. Position your hands in front of your hips with a gap of around 300mm or a foot between your hands and your hips.
This is not really a fighting stance, but a formal starting position in Taekwondo.