Before we get into the process of setting up your wallet, go over these basic security principles to make sure that you don't miss any important information and that you don't make any avoidable mistakes.
Password and biometrics on Blue Wallet.
Seed backup recovery codes.
Wallet passphrases.
The Seed backup allows you to recover your Bitcoin wallets.
Your passphrase allows you to unlock the recovered Bitcoin wallets.
The PIN protects unauthorized access to your BlueWallet, should it fall into the wrong hands.
They will be able to unlock the wallet, but they will not be able to spend funds without your biometrics.
They will not be able to recover your Bitcoin wallets without the passphrase.