You can Enter the referral code from the Hudder application
Existing User
Open the Hudder application and tap the menu icon at the top left.
1. Select Refer & Earn and tap Enter code
2. Enter your friend's referral code then tap Submit
Note: This action is irreversible and cannot be undone, once you submit a code, this option will no longer be available.
New Users
If you are a new user and were referred by a friend to become a Hudder, you will find a step to enter the referral code during the registration process. You can enter your friend's referral code at that point.
To create a new account, follow this link for guidance How can I Create a Hudder Account?