Update iPhone 6

An iPhone 6 can't be updated beyond 12.5.7, it doesn't have the hardware needed to run anything higher.

If you need a higher iOS version, you will have to purchase a newer phone.

To update to 12.5.7 -

Go to Settings > General > Software Update.

This link will show you how to update your iPhone, iPad, or iPod touch using WiFi -

Update your iPhone or iPad - Apple Support

This link will show you how to update using your computer -

Update iOS on iPhone - Apple Support

Your iPhone 6 is ancient and unsupported. It cannot be updated beyond iOS 12.

If you want to use features or apps that require iOS 13 or later, then you must purchase a newer model iPhone.