Every Stellar account has a public key and a secret key.
The public key is always safe to share — other people need it to identify your account and verify that you authorized a transaction.
You will also need your Vault public key to set up the multisig solution in LOBSTR wallet, StellarTerm or other services.
If you are currently setting up or recovering your LOBSTR Vault account, you can find your public key at the 'Your Vault Public Key' screen.
Use the 'Copy Key' button to transfer your key. The QR-code contains your Vault public key as well - you can scan it using your LOBSTR wallet app on another device.
If you are already inside your LOBSTR Vault account, you can find your Vault public key at the 'Home' screen or in the 'Account' section of the 'Settings' screen.
If you try finding your account using a network explorer like StellarExpert, you may receive a message that your account does not exist on Stellar ledger.
Do not worry, your account is safe. It is stored locally in LOBSTR Vault app. The account does not need to actually exist on the Stellar Network to act as a signer for your main account.
If you want to use your LOBSTR Vault account as a wallet, you would need to create and fund this account at first.