Holding the rope in your left hand, have the running end of the rope dangling down. With your right hand, move the running end over the left hand and create a loop (or turn) in the rope and secure it in your left hand. Note that the short, free running end of the rope has to be 'on the top' of the loop. Now comes the ridiculous but useful 'rabbit and tree' bit. Taking the rope running end as the 'rabbit', put it up through the hole whilst being sure to leave a sufficient amount of rope to make the bight. Pass it around behind the standing end 'tree' and then back down the hole. At this point many beginners lose the knot by not pulling on all parts of the knot to tighten it. The easiest way is to hold both sides of the loop plus the free 'rabbit' end in your left fist. Grab hold of the long, standing end of the rope with your right hand and pull upwards to tighten.