How to install iOS 14 in iPhone 6

You can't.

An iPhone 6/6 plus 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 Update your iPhone or iPad - Apple Support

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

Update iOS on iPhone - Apple Support https://support.apple.com/guide/iphone/update-ios-iph3e504502/ios

The iPhone 6 can be updated to iOS 12.5.7, no further.

You can't. The max in iOS 12.5.7