How do I turn on "Find My" in iPhone ?

There is only one way to enable and turn Find My on........you must have the phone in your hands.

When you have the phone in your hands......

Tap Settings

Tap [Your Name]

Tap to turn Find My on

If the phone is missing or lost.....I'm sorry, but it's too late to enable Find My

toni-skie wrote:

I need to turn my iPhone back online but don’t know how pls help

Here is how to: Set up Find My on your iPhone, iPad, or Mac - Apple Support

Find My cannot be remotely enabled remotely.