To log in Board.Vision (BV) using touch id, you have to log in to BV with your log in account first.
Note: The touch id feature only applies to iPhone 8, 8 Plus and below.
Step 1 - Log in to BV with your login id and password.
Step 2 - Type your 4 digit pin.
Step 3 - Quit or kill the BV app.
For the steps, how to kill the BV app, click this link:
Step 4 - Tap on the BV app icon.
Step 5 - When the BV app prompt "Touch ID for "Board.Vision" Touch ID/Face ID Login". Place your thumb on the iPhone home button (see red square).
Step 6 - Type your digit pin.
Step 7- You can also download the video for the steps. (see attachment).