How to mountains

Hello, I am having trouble on making mountains on the new free version of Unity 3d and I cant find out how to make them?

It is simple:

  1. Create a terrain.

  2. Use the brush to raise the height. You probably want a rough look.

  3. Paint it.

download terrain toolkit from here: http://unity3d.com/support/resources/unity-extensions/terrain-toolkit.html