New Discussions has been disabled for all new members due to last years spambot attacks. So in order to start new discussions, you must become a member. In order to become a full member, you will need 50 points, 30 posts and an account older than 24 hours.
For any New members who what to get their post count up, the best thing that I would advise you to do is to find threads that may interest you and join in on them or go to the Off Topic section and join in on some of the word/story games over there. The posts made over in the forum section will go towards your post count whereas the posts made on your wall and the Activity Feed doesn't go towards the total post count. The only thing that you will get if you should make any post over on your wall or Activity Feed will be any Insightfuls, Likes or Awesomes as they will go towards your total points count. Hopefully creating your posts on other threads will also increase your points... :)