Since BlueWallet is a non-custodial Bitcoin wallet, a username and password are not required for account access. Rather, you use your smartphone, wallet backup, or recovery phrase to access your wallet. To examine balances, send and receive Bitcoin, manage Lightning wallets (if configured), and track transactions, launch the BlueWallet app and choose your wallet. You can use your recovery phrase to get your wallet back if you've lost access to your device. Always download BlueWallet from its official sources, and never divulge your recovery phrase or private keys to third parties.