1. **Log in to Your Roblox Account:**
  Go to roblox.com using your web browser or open the Roblox application and log in to your Roblox account.

2. **Navigate to the Home Page:**
  After logging in, navigate to the Roblox home page.

3. **Go to the Robux Purchase Page:**
  On the main page, you'll typically find an option like "Buy Robux" or "Get Premium." Locate this option and click on it.

4. **Select Payment Method:**
  To purchase Robux using the Roblox Gift Card, you may need to choose a payment method first. Proceed with a credit card or another payment method.

5. **Click on "Redeem a Code" After Choosing the Payment Method:**
  During the payment process, you'll usually see an option like "Redeem a Code" or "Use Gift Card." Click on this option.

6. **Enter the Roblox Gift Card Code:**
  Enter the 10 or 12-digit numerical code found on the back of the Roblox Gift Card. This code typically consists of letters and numbers.

7. **Confirm the Code:**
  Click on the relevant button to confirm the code you entered.

8. **Robux Added to Your Account:**
  When your code is successfully confirmed, the amount of Robux will be automatically added to your account.

After loading your Roblox Gift Card, you can use the purchased Robux to make in-game purchases, customize your character, or take advantage of other in-game benefits. Keep in mind that each Roblox Gift Card has a specific validity period, and you need to use the code within this timeframe.