Step 1: Register a device
First,to check if you have a compatible device. If you see a device under "these devices can get prompts" select the device and follow the instructions. You should see something like this:
If you are able to setup a device as instructed, you're all done, there's no need to do step 2.
If you see no devices please continue to step 2 below.
Step 2: Register SMS & Google Authenticator
If you have no registered devices,to register your phone number for SMS or phone call prompts (either is fine but we prefer SMS).
Now,to register the Google Authenticator app as an alternative method. Google Authenticator will provide a more reliable and secure method of authentication.