1987 pathfinder 4 wheel drive

i recently purchased a 1987 pathfinder. i'm not sure how to engage the

4 wheel drive and i don't want to mess it up. when i move the 4 wheel drive control stick it seems to have on 2 positions: up or down. however, there are 4 settings on the knob. anybody know how to do this?
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marykosciolek
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