If you want to change Yahoo Mail Security Question then in that case, it is recommended to make sure that you have a strong and stable internet connection. Click on Home and then, go to My Account, and on the left side, just click on Security Options and Under the Security, question click on Edit security question. Now, choose a security question and enter your own question if required and enter a secret answer to the available question and enter your Yahoo mail password and confirm the changes by. clicking on option Save Changes. Call on Yahoo Phone number Uk to get in touch with technical teams in case you are facing any issue.