To make sure your Known Traveler Number/TSA-Precheck or Redress number shows up on your flight tickets, you can input these numbers by accessing your Fairjungle profile, by clicking on your name in the top right corner :
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You will find the KTN / Redress number field in the Account section, where you can simply click on "Add" :
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You can then fill in either or both of these fields, and then save the changes :

These details will automatically apply to any eligible flight booked through Fairjungle.