How to add TSA pre to Delta?

Here are the steps on how to add TSA PreCheck to Delta:

Go to the Delta website: https://www.delta.com/ and sign in to your account.

Click on the "Profile" tab.

Under "Personal Details", enter your TSA PreCheck Known Traveler Number (KTN) in the "TSA PreCheck/Known Traveler ID" field.

Click on the "Save" button.