"Stern" is the back of the boat. "Aft" means "towards the stern."
"Bow" is the front. "Forward" means "towards the bow."
"Leeward" (pronounced "loo-ard") is the side away from the wind (low side).
"Windward" is the side towards the wind (high side).
Back to weight placement - the Hobie 16 (in fact, most Hobies) likes to be sailed with your weight as far forward as possible - without putting the leeward bow underwater which can result in a pitchpole in higher wind.
In light air, this means that the crew will be on the forward leeward trampoline corner and the skipper is on the windward corner.
http://ordering.michaelbagleyphoto.com/p991273920/e3399160bAs the wind increases, the crew moves up along the front crossbar until they are in the front corner and the skipper starts to move aft. Even while trapezing, keep your weight forward and only move back as the waves and wind increase.
http://ordering.michaelbagleyphoto.com/p991273920/e20ce0f2d