You can manage your two-factor authentication information from your Account Settings page.

1. Click Menu > Account
2. Under Two-Factor Authentication, click Change Phone Number
3. Enter the new mobile phone number and click Send Verification Code ˜A Six-Digit Code will be sent to your mobile device.˜
4. Type that code under Verify Phone Number and click Submit

µVerification codes will now be sent to this phone number.µ

You can manage your two-factor authentication information from your Account Settings page.