Two- step verification is the best method for getting extra security in Yahoo. So to add the two step verification, you need to implement the given below-mentioned steps:
Turn two-step verification on/off
· In the beginning you need to sign in and go to your Yahoo account security page.
· After that next to Two-step verification, enter the toggle button to enable .
· Now you have to enter your phone number.
· You need to enter Send SMS for receiving a text message with a code or Call me for receiving a phone call.
· Finally enter the verification code and enter Verify.
You can call customer support of yahoo team for instant help
How to Add Two Step Verification for Getting Extra Security in Yahoo