Always use the crosswalk and sidewalk around the perimeter of the roundabout. NEVER cross to the central island.
Only cross when it is safe. You have the right-of-way, but make sure that drivers see you and stop for you. When crossing an entry or exit with more than one lane, be sure that vehicles in both lanes are stopping for you.
Look towards the roundabout when crossing the exit lanes. Look towards the approaching traffic when crossing the entry lanes.
Use the pedestrian refuge in the splitter island. It allows you to cross one direction of traffic at a time.