You can clear a user's answers to security questions. For example, you might want to do this if the user forgot the answers, or if the security of the answers was compromised in some way. After answers are cleared, the user must provide new answers in order to use security questions for self-service troubleshooting or risk-based authentication.
In the Security Console, click Identity > Users > Manage Existing.
Use the search fields to find the user that you want to edit. Some fields are case sensitive.
Click the user that you want to edit, and select Edit.
Under Account Information, select Clear user answers to security questions.