Maybe you weren't loggin in, ?? don't know
Go here:
http://www.forabodiesonly.com/mopar/
select the forum category you want, let's say "Automotive Technical Forms", and "Electrical and Ignition"
http://www.forabodiesonly.com/mopar/forumdisplay.php?f=54
"New Thread" should be button just above and left of the purple colored header