Sounds like you lost your cookies, so to speak.
To reset your FlyerTalk cookie so that the system remembers your login information, go to the following link ("Preferences"):
http://www.flyertalk.com/forumcgi/ub...ction=setprefs
Once you've completed the instructions on that page, you'll still have to enter your name and password one more time when you next post, but after that your information should be stored properly on your computer for a year.
(Remember that after you click the "Delete cookies" link, you'll have to set another one by clicking the "Submit Preferences" button at the bottom...)