Hi, you don't have to worry about the Poachie sinking in the water, as long as you immerse it vertically with both flaps held together.
Poachies are designed to immerse fully in the water; as you lower them in vertically, the Poachie will sink, and as it does so top flaps will close together like magic, sealing the egg inside while it cooks.
Use 3/4 full Saucepan of water.
TO OBTAIN THE CLASSIC SHAPE always immerse the Poachie vertically into the gently bubbling water. Carefully hold it upright in the water for a few seconds before releasing, then as the Poachie gradually sinks, the "mozerella ball" shape will be formed.
Hope this helps
The Poachie Team