My iPhonemy is saying find my is disabled because someone erased my iPhone how do I get it back on everything else has come back

Hey there rise177,

If you have access to your iPhone, you'll want to take the following steps to enable Find My:

Open the Settings app.

Tap your name, then tap Find My.

If you want friends and family to know where you are, turn on Share My Location.

Tap Find My [device], then turn on Find My [device].

To see your device even when it's offline, turn on Find My network.* 

To have the location of your device sent to Apple when the battery is low, turn on Send Last Location.

If you want to be able to find your lost device on a map, make sure that Location Services is turned on. To do this, go to Settings > Privacy > Location Services, and turn on Location Services.

For more details, use this link: Set up Find My on your iPhone, iPad, iPod touch, or Mac - Apple Support

Take care!