Step 1) Download an authenticator app on your smartphone.
Some popular apps:
Google Authenticator
Authy
Okta Verify
I personally use Google Authenticator and think it offers the easiest set up
Step 2) Go to your Action ID account at myacount.ngpvan.com
Step 3) Change your method of 2-factor authentication
Turn off text messages of your 2-factor, then under two-factor Authentication, select "Use authenticator app"
Step 4) In your Authenticator App, click the plus to add a new account, then use the camera on your phone to scan the barcode on your computer screen.
Step 5) Once you've scanned the barcode, enter the code generated by your authenticator app.
Step 6) Save the back-up code VAN gives you on the next screen. You will need this to get into your account if you ever lose/replace your phone.
Now that you've set up an authenticator app, you will be prompted to enter the code from your app whenever you log into VAN on a new device. This code changes every 30 seconds and is way more secure than a text message