PC - Redeeming a SHiFT Code in Borderlands 2

1) In the main menu of Borderlands 2, select "Extras."

2) Select "Shift Codes" from the "Extras" menu.

3) From the "My Offers" screen, choose "Shift Code."

4) Enter your 25-digit SHiFT code for Borderlands 2, then hit "Submit."