If you want to change it due to security reasons, log in to the Yahoo mail account security page. Now the question arises, where is the Yahoo account security page? The answer is to go to the Yahoo mail login page, enter your credentials to sign in. Click on the horizontal lines to open the menu and then follow the steps mentioned below: Click on the 'Manage Accounts' option. First, click 'Account info' and then click on 'Security Settings.' You will land on the Yahoo mail account security page. Click on the 'Change Password' option and then fill in the details asked in the Pop-up window.