Go to Find My iPhone on iCloud.com.
If you don’t see Find My iPhone on iCloud.com, your account just has access to iCloud web-only features. To gain access to Find My iPhone and other iCloud features, set up iCloud on your iOS device or Mac.
Click All Devices, then select the device you want to track or lock.
Click Lost Mode (iOS 6 or later), or Lock (iOS 5 or OS X v10.7.5 or later)
Follow the onscreen instructions, keeping the following in mind:
If your iOS device or Apple Watch has a passcode, it’s required to unlock the device. Otherwise, you’re asked to create a passcode now.
If you’re trying to place a family member’s iOS device in Lost Mode, and the device doesn’t have a passcode set, that person’s Apple ID password must be entered on this computer.
Note: If you forget the passcode, or if you set an EFI firmware password on your Mac before it was lost, then lock it and later find it, you may need to take it to an authorized repair center to unlock it.
If you’re trying to lock a family member’s Mac, that person’s Apple ID password must be entered on this computer.
If you’re asked to enter a phone number, enter a number where you can be reached. The number appears on the device’s Lock screen.
If you’re asked to enter a message, you may want to indicate that the device is lost or how to contact you. The message appears on the device’s Lock screen.
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