1. Open the hypershade.
2. Go to the shader Library.
3. Find the shader that you want, and right click on it and click import.
4. On the top of the Hypershade click on your layered texture.
5. Middle mouse button drag the imported shader to the red rectangle on the attribute editor for the layered texture.

From here, I assume that you know how to use a layered texture. But maybe some step was not very clear, in that case just post another message, and I'll try to answer more.