How do I set it

Turn the knob, sorry just fooling with you. You need to give us more details before we can tell you how to set something. Like what ist is.

Dig a shallow hole about 2 inches deep,be sure to put the roots facing down and cover, do not pack dirt ,just loosly cover,, :), lol

Ron Popeil says "Set it and forget it"

I like to set them facing south.