I tried lot of things for redirect uri

could u tell what should I enter
here are settings which I have kept
appdomain: startupmachine.co
site_url - forum.startupmachine.co
redirect_uri: forum.startupmachine.co
but i tried lot of things in all of these fields (spent a whole night with all combinations )

Great work man!
is there a way to add multiple shoutboxes in a forum?
say one in each category page.