Here's what you do:
Click on Flight/Hotel/Car
Pull down menu pops up, click on Manage Reservation, assuming you have your Conf # enter your first and last name along with you conf #. Your flight details will load. There will be an option to add your rewards number. Click on that and add your rewards number and press save. There! Log out and log back in and your trip should be in your My Travel section.
Your welcome.