Once you are in the roundabout, simply stay in your lane until your exit. It is important to choose the correct lane on entry so you don't have to change lanes in the roundabout.
While driving in a roundabout, watch for large vehicles that may take up more than one lane. Never pass a large vehicle when there isn't enough room to do so. Give large vehicles extra room to ensure they are able to safely enter and exit the roundabout.