To apply a shader, you need a material.
You can create a material by clicking 'create' in the project view.
If you use the shader code from the given link, the shader should be in the shader dropdown list in the inspector when selecting a material, under Custom.
You can change the main texture or the other properties through code or in the inspector.
See here: http://docs.unity3d.com/Documentation/ScriptReference/Material.SetTexture.html