To redeem a Steam gift card, follow these steps:

1. Open the Steam client on your computer or launch the Steam website in your web browser.
2. Log in to your Steam account. If you don’t have an account, you can create one for free.
3. Click on your account name (located at the top right corner of the Steam client) and select “Account Details” from the drop-down menu.
4. On the Account Details page, locate the “Add funds to your Steam Wallet” section and click on the “Add funds” button.
5. Choose the “Redeem a Steam Gift Card or Wallet Code” option.
6. Enter the code in the provided field and click on the “Continue” button.
7. Steam will validate the code and add the gift card value to your Steam Wallet balance.
8. Once the redemption is successful, you can start using your Steam Wallet balance to purchase games, downloadable content, in-game items, and more.

Visit https://store.steampowered.com/eula/471710_eula_0