Two-step verification is now available for Apple ID account holders. The information below is an overview from the Apple website. You need to sign-in to see these instruction on the Apple site, which you probably can’t do if you’re having trouble with logging in.
Two-step verification for Apple ID.
With two-step verification, your identity will be verified using one of your devices before you can make changes to your account, sign in to iCloud, or make iTunes or App Store purchases from a new device.
(1) You enter your Apple ID and password as usual.
You will also get a Recovery Key for safekeeping which you can use to access your account if you ever forget your password or lose your device.
Simple and more secure.
Once enabled, the only way to make changes to your account will be to sign in with two-step verification.
For more information, read the FAQ.
Important things to remember.
Please make sure you understand the important security policies below before you turn on two-step verification.