How can i have a star above my profile?

You would automatically get a star once you have reached 100 postings (the number that you see next to your nickname within brackets). You have just started and are at 14 at the moment. But to get a high rating, people should give you a + rating (seen at the right side of the discussion matter) and this woyuld happen if you make useful and quality posts. You can also reply to discussions started by others and rate them, if you feel they are good and useful. All the best to you and get the 100 number to obtain your star.