There are five steps in sending a transaction:
1) In the app, select the account from which you want to make a transaction. Make a transaction request by filling in the transaction details
2) Scan the QR code generated by the app with the ZERO
3) Verify the transaction details on your ZERO screen and sign the transaction request offline with your fingerprint and PIN
4) Scan the QR code of the transaction signature displayed by the ZERO with your app
5) Your transaction is now broadcasted by the app to the blockchain.