The trophy you received is the 'you made your first post' trophy. Different trophy (there's a bunch of trophies for various things). The trophy for getting approved will say something about being approved.
I'd you can't reply, it won't let you. The text box won't appear.Though I might be taking a risk for replying to you, I'm wondering if I'm allowed to reply, comment, or chat on the allowed forums. I've read the rules for approval so far, but I still don't seem to understand. Is it alright to reply?