If you’re using an iPhone 6, there’s a good chance you have to change your touch ID. This is necessary in order to use certain features that require a different type of authentication, like buying items online or using certain apps. To change your touch ID on your iPhone 6, follow these steps:

  1. Open the Settings app and navigate to the General section.
  2. Scroll down and find the Touch ID section.
  3. Toggle on the “Change Touch ID” option under “Security.”
  4. Enter your new touch ID information into the fields below and click OK to save the changes.