You need Two-Factor Verification for your Amazon Account

If you have a strong password for your Amazon account, you may still want to consider beefing up the security with two-factor verification (or authentication), which will prevent a thief from accessing your account (which is possible if he gets ahold of your password and use ame somehow).

• Log onto your Amazon account.
• Have your mobile phone with you.
• Click "Your Account."
• Scroll down where it says "Settings—Password, Prime & E-mail."
• Click "Login & Security Settings."
• Go to "Change Account Settings" and at the bottom is "Advanced Security Settings." Hit "Edit" there.
• You are now on the page for setting up two-step verification. Hit "Get Started."
• You will see two options. For ease of setting up the two-factor, choose the text message option.
• Follow the instructions and wait for the texted code.
• Enter the code and click the "continue" button.
• You will now be on a page for adding a backup number—which is required.
• You cannot use the same phone number you just did for your initial setup. If you do not have a landline for the backup number, and your only phone is a "dumbphone," you will not be able to use the two-factor service from Amazon.