To enter a Roblox gift card, first log in to your Roblox account on their website. Once logged in, visit the Gift Card Redemption page. There, you will see a box where you can enter the gift card PIN code. Carefully type the PIN code into the box and click on Redeem. This will add Credit or Robux to your account.
If you wish to use the credit immediately, you can select Use Credit. This step is optional but handy if you want immediate access. Finally, click on Close if you are done or want to redeem another gift card code. Enjoy your new in-game currency and have fun exploring Roblox!