Hi, and Welcome,

If you have the miles for your flight, you should call the Airline Mileage Program Rewards Number, e.g. Northwest WorldPerks Rewards Desk, Continental One Pass Rewards Desk.

Once you are on the phone with the agent, they will be able to guide you through the process to use your miles towards flight awards.

I think, and I may be wrong, there are some programs which allow you to book reward travel online, however, I do not know much about that!.

Good Luck,
AK