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at the main menu, go to the "Extras" menu, and select "Shift Codes", it will bring up a new menu listing all the shift codes you've redeemed, Press X at this menu to bring up the box where you enter the codes
Also, major props TC and other guy (lol), thanks for this
"Our glory and our downfall. Embrace the terrible risks of war; drive home the spear." - A Talent For War GT: Trialzero