there are nuts on the bolts that you need to loosen before trying to (tighten) the bolts. Unless your just going to losten the bolts then the nuts will stay in place.
off the top of my head loosening the bolts will tighten the chain. (cant remember 100% could be the opposite)
yea i tried loosening everything and nothing moves..There is a big bolt going across under the skid plate ..I am wondering if i need to loosen that before i can loosen the chain??