Hello UNIT 300,
At checkout, enter your code in the "Gift card or discount code" field, on mobile at the top you have to click show summary enter your code in the "Gift card or discount code" field, and press "Apply".
The price of the shirt is u.s. $ 777,772.77 the discount code will lower it to u.s. $24.99 without personalization u.s. $29.99 with personalization.
Year Two Moments of Triumph Donation T-Shirt FAQ.
https://www.bungie.net/en/Help/Troubleshoot?oid=44923
English
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Thank you.
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You're welcome.