A bit late perhaps, but here goes.
1 Tear off the left bottom of the cover from the 1Y mark to the 2Y mark. Take out the sauce and the furikake. Pour warm water up to the marked line on the inside, add the contents of the bag and wait for 3 minutes.
2 Remove the cover from the 3Y and follow the dotted line, it will create an opening for the water.
3 Hold the cup in a firm grip and gently tilt the container allowing the water to pour out. of the opening. Add, and mix the sauce and furikake. Done!