Melt the chocolate in a double boiler or in short bursts in the microwave. Fill the molds with the chocolate and swirl to coat the sides. Alternatively, use jorgegunn's method as detailed in Handmade Chocolate Boxes
to fill the molds entirely, let the outsides set, and pour out the excess.
Once the molds are set, plop a filling ball into half of each mold. Using more melted chocolate, join the two halves of the egg together.
Let set and demold. The freezer does wonders for this step.