When you first register an account at Indodax, you will find a column to enter your “Referral ID Friend.” If you don't have a referral code, this field can be left blank because it is only optional. You can still continue the account registration process without entering the referral code. Not including the referral code will not affect your account registration process at Indodax. Make sure to fill in other mandatory information, such as email and personal data correctly and completely. After registration is complete, you can immediately start trading and enjoy the various services provided by Indodax. After your account is successfully verified, you can also get a referral code that belongs to your own Indodax account. For the steps, please check the following link.