How can i update my phone to iOS 13

hello 🤗

like stedman1, your iPhone can not be updated beyond iOS 12.5.6 you can update your iPhone to iOS 12.5.6 if you don’t have this update (but not iOS 13 or later) follow this link to update your iPhone to iOS 12.5.6 Update your iPhone or iPad - Apple Support

If you want iOS 13 or later, please buy a new iPhone.

if you have more problems or questions, come back us or contact Apple Support

You can not.

The iPhone 6 can not be updated beyond iOS 12.5.6.

Please see reply above.