http://forum.toribash.com/showthread...hlight=bumpmap
http://en.wikipedia.org/wiki/Bump_mapping
There you go.
Bumpmapping is in 3.9, you just need to take off shaders, as it doesn't work with shaders enabled. As stated above, you to buy the bumpmap item and add a normal map to it. There might not be many tutorials on the forum, but there are other tutorials across the internet about bumpmapping and you can simply google to find them.