Lady's Daughter, this is where you post the review replies thread, under the appropriate subforum (het, slash, etc.) : http://www2.adult-fanfiction.org/forum/index.php/forum/386-harry-potter/
There you can discuss the story as much as you like, and guests can post there too. You don't need an account here to do this, but of course signing up for a forum account will give you full access to the forum, which is never a bad thing.
There is a validation period (I think Melrick usually runs the queue once a day, unless he's busy in RL) but you can continue to use the forum just like you can as a guest while waiting for validation.
Happy writing, and welcome to the forum, if you decide to sign up
Willow Darkling, Forum Moderator.