Adding bump mapping on a game?

#1
I am planning on adding bump mapping to 087-B, but i just know the very basics of Blitz3D. Can someone teach me how to add it?
Oh, and by bump mapping, i mean like this:
Image
I would be very thankful if someone could explain to me :)
this is an signature you know?
yep a signature
didn't know that
me 2 m8
._.