Remove a device from 'Find My iPhone' app
Solution 1:
If you have physical access to the device, to into the iCloud settings and turn off "Find My iPhone". If you don't, You can remove devices from iCloud.com, provided iCloud can't find them. Go to the "Find My iPhone" section on iCloud.com. Click the device to select it, then click the circled "X" on the right. This removes the device from Find My iPhone.
You can also remove devices from the Find My iPhone app by swiping horizontally on the device. Again, the device must not be locatable for this to work.
