Turn off my iPhone finder

Hello and welcome to Apple Support Communities, iPhone_7_help!

We understand you want to turn off Find My on your husband's iPhone so that you can send it in for replacement. We'd be happy to provide information on how to do this.

Follow the steps outlined here: What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch

"If you no longer have your iPhone, iPad, or iPod touch

If the steps above weren't completed and you no longer have your device, use these steps:

1. Ask the new owner to erase all content and settings using the above steps.
2. If you're using iCloud and Find My [device] on the device, sign in to iCloud.com/find or the Find My app on another device, select the device, and click Erase. After the device has been erased, click Remove from Account.
3. If you can't follow either of the above steps, change your Apple ID password. This won't remove personal information that's stored on your old device, but it prevents the new owner from deleting your information from iCloud.
4. If you're switching to a non-Apple phone, deregister iMessage. 
5. If you're using Apple Pay, you can remove your credit or debit cards at iCloud.com. Choose Account Settings to see which devices are using Apple Pay, then click the device. Next to Apple Pay, click Remove.
6. Remove your old device from your list of trusted devices."

Have a great day!