Check your email. Yahoo is notifying potentially affected users by email, so check to see if you received one of those notices. Review your account activity. Yahoo offers a Recent activity feature that shows the the times/locations of each sign-in to your account, which can help you determine if there’s been unauthorized access. Here’s how to use it. Change your information. Immediately change your Yahoo account password as well as your Yahoo account security questions and answers - even if you don’t think your data was stolen. Here’s how to do it. Enable two-factor authentication. Two-factor requires you to have your smartphone handy when you log in to your Yahoo account, because it will send you a code via SMS, which you need to enter along with your password when trying to gain access to your Yahoo account. That means a hacker will need more than just your password to get access, too. Here’s how to do it. Alternatively, use Yahoo’s Account Key. This feature basically replaces written passwords with a smartphone app. It’s like an alternative to two-factor authentication. Here’s how to do it.
