how to sync contacts to Facebook on iPhone 6 plus?

Hi LASOCAL333,

It seems you would like to sync contacts via Facebook on your iPhone. The following article provides information which you may find helpful:

Use Facebook, Twitter, and other social network accounts with iPhone, iPad, and iPod touch - Apple Support

Sync contacts and calendars

iOS can sync your Facebook contacts and calendars with your device. This feature is off by default. After adding your account, you can turn the feature on in Settings > Facebook.

Thank you for contributing to Apple Support Communities.

Take care,

Bobby_D