Using codes in Roblox is done through a simple redemption process within the game or on the Roblox website. Here's how to use them generally:

1. Find a Roblox code: Codes can be found on the game's description page, official Roblox websites, social media channels, or from game developers.
2. Open the Roblox game or go to the Roblox homepage.
3. For in-game codes:
   • Access the game you want to redeem the code in.
   • Open the game menu and look for a "Codes" button or option.
   • Click on the "Codes" or "Enter Code" button.
   • Enter the code exactly as it appears (codes are usually case-sensitive).
   • Click "Redeem" or "Submit" to get your rewards.
4. For Roblox promo codes (such as virtual items or currency) via the website:
   • Log in to your Roblox account.
   • Go to the Roblox code redemption page (roblox.com/redeem).
   • Paste the code into the box.
   • Click the "Redeem" button.
   • If the code is valid, you will receive confirmation and the item or currency will appear in your inventory.
5. For outfit or avatar item codes:
   • Search and open the "Avatar Catalog Creator" game in Roblox.
   • Click on the "Catalog" or "Featured" section.
   • There should be an option to "Enter Item Link" or "Enter Code."
   • Paste the outfit code and apply the item to your avatar.

These steps allow you to redeem codes for items, currency, or other in-game rewards, enhancing your Roblox experience.