How to use my own material on terrain?

I thought that I can use the material field in terrain properties, but its wrong, it’s a material for base map only.

And how can I use my own material/shader on terrain?

 

If you want to use your own replacement shader for the terrain you'll need to override the default shader by changing your shaders name like so --

Shader "Hidden/TerrainEngine/Splatmap/Lightmap-FirstPass"

 

Lot of thanks.