FanFiction forums how do you make a reply to a posted topic?

I feel so stupid for asking, but I see no 'reply to this post' link anywhere, there is only a reply link under each post posted under the topic. I found the perfect topic where I want to start talking about the fan fic I've started writing lately, but I can't figure out how to work this darn system, so any help?

Please, you're dealing with a virgin here so be gentle.

It's my first fan fiction.., so ya I'm a newbie *shrinks away*