Easiest way for me is to upload the picture on imgur.com, then just copy and paste the "BBCode" link from imgur, like this (code is "[ IMG ]http://i.imgur.com/5LxYP1el.jpg[ /IMG ]" but remove the spaces within the brackets
Serial numbers on the 16 are on the upper portion of the vertical surface the very back of each hull (just above where the rudder attaches).
Also, read this http://www.hobiecat.com/articles/boat-serial-number-location,15/
Bradley M. Davis - YouTube Videos
'76 H16 Flamer #20060 - restored and sailing
'84 H16 Blue Hawaii #79922 - under restoration