Well, I wanted to ask a question "Why can't I post a thread in DP market, I have been member for over 2 weeks and I do have 25+ posts" Yet there is no help section, so I recommend you add one.
You have joined dp as on 'Feb 5th 2010' so you have to wait another day or two for your permission to post in BST. And for help section there is FAQ/Rules already so go through it first properly. DON.
As i told you earlier that wait for another day or two for cronjob to run for your permission. Thats all. DON.
Yes you made first post on 12th Feb 10.08 AM ( IST Time ) so you need to wait till 26th Feb 2010 to start a thread in BST.
If you read the message the system gives you when you try to do it, it even gives you a link to detailed information page about why.