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Registration is where the referral code belongs
If you are here because there is nothing to log into yet, the sequence is slightly different — and it includes one field that cannot be revisited. The sign-up form asks for a username, an email address, a password and, optionally, a Referral Code. That last field is the only place SHFLVIP can be entered.
There is no equivalent input in account settings afterwards. An account created without a code stays that way, so if you intend to use one, it goes in before the form is submitted. The step-by-step version, with a screenshot of the field, is on the Shuffle casino promo code page.
Once registered, set the password to something unique, turn on two-factor authentication, and read the current bonus terms on Shuffle before deciding what to deposit. Then the casino games and the sportsbook both run off the same balance.