well to post a reply, just do what you just did, and you'll be doing great
to start a new thread, go to the part of the forums where you want to start a topic and click on new thread, then type away.
Make sure you aquatint yourself with the rules first of course, especially if you want to post asking for a slave or master (or to be one)
http://www.getdare.com/bbs/showthread.php?t=2723
this one also has some tips on writing a good post -->
http://www.getdare.com/bbs/showthread.php?t=239
I'd also recommend LittleStrawberry's most excellent guide to writing a slave request
http://www.getdare.com/bbs/showthread.php?t=5193