conniepeng - the test window was extended to March 8 to accomodate everyone impacted by the snow storms on the east coast. However, it has been posted that they had to open it up nationwide. This period will be considered part of Jan/Feb test window and part of wave 2 release. Good Luck on your exam.
As far as reschedule you can do that anytime and online at prometric website but it will cost based on how close you are to your test date for you probably anywhere from $75+ depends on your state since you are within 5 days. In most cases you cannot reschedule within 24 hours of your exam. You either take the exam or forfeit your money.
Becker - FAR 80, AUD 73, 81, BEC 76, REG 81 (2010) DONE!!!! IN LICENSED CPA