Hi Crewmates! Most cosmetics are handled primarily in the game when you buy them from the store. But looks like you've received a shiny cosmetic code! Here are the steps to redeem it:
You'll need to go to accounts.innersloth.com/redeem
Once you're there, sign in with the account you want to redeem the code. Please note that this redemption code only applies to Steam, Epic, Google Play, Apple, Xbox Live, or itch.io. Switch and PlayStation cannot use redemption codes.
Once you're signed in, enter the code in the Redeem Code screen. If everything goes well, you'll see the "Successfully redeemed code" in green text and you're on your way to enjoy your shiny cosmetic!