you can either change its position in WED,
unless you've added a camera position, the default will be at 0,0,0 so you could change the camera position
if you're using lite-c without WED, when you create the terrain
use something like...
me = ent_create("the_terraid.mdl", nullvector, NULL);
vec_set(my.x, vector(0, 0, -100); //move the terrain down 10 quants
vec_fill(my.scale_x, 2); //make the terrain twice it's size
my.pan = 90; //change the yz angle of the terrain
hope this helps
