To claim the ₹500 cashback using the code YGHDSD on FirstClub, you typically need to apply it during registration.

Referral codes are usually entered in a specific field while creating a new account and cannot be added later. It is also likely that this offer is exclusively for first-time users only.

Here is the general process to apply the code:

1. Download the App: Install the FirstClub app from the Google Play Store (Android) or Apple App Store (iOS).
2. Start Registration: Open the app and sign up using your mobile number.
3. Enter the Code: Look for a field labeled "Referral Code," "Invite Code," or "Offer Code" during the sign-up process. Enter YGHDSD in this field.
4. Complete Verification: Complete the OTP verification and fill in your basic profile details.
5. Check Wallet: After signup, navigate to the "Wallet" or "Rewards" section to check if the ₹500 cashback is reflected.

If the code does not work:

• Ensure you are a first-time user.
• Double-check that you entered the code exactly as YGHDSD (usually case-sensitive).
• Some cashback offers require you to make the first purchase before the amount is credited to the wallet.
• Since promotional codes can expire, it is possible the validity of this specific code has ended.