Changing your email password on an iPhone 6 is crucial for maintaining your online security. Follow these steps to update your email password on your device:

1. Open the Settings app on your iPhone 6.
2. Scroll down and tap on 'Passwords & Accounts'.
3. Tap on the email account for which you want to change the password.
4. Tap on the 'Account' field at the top of the screen.
5. Next, tap on 'Password' and enter your new password.
6. Tap 'Done' to save the changes.
7. Your email password has now been successfully updated on your iPhone 6.

It's important to regularly change your email password to enhance your online security and protect your sensitive information from cyber threats.