Hacking scares to users as well Yahoo Inc. too; Yahoo wants their users to feel secure and safe against any such hacking concern. So, Yahoo introduced the advanced level of security with Yahoo Account Key option. You can activate this security feature with your account after signing into your Yahoo account. This is easy to activate and once you activated it successfully; then you can forget about manually using the password. When you find some issues with Yahoo Account Key; you can take help from the Yahoo help page using the link https://help.yahoo.com/kb/account/questi...mpressions=true. If needed, you can call Yahoo customer support toll-free number for instant help.