To disable the “Find my iPhone” feature, please go to Settings > iCloud > Find My iPhone, and turn it off.
You will need your iCloud password to do this. If you have forgotten it, then you should reset your password.
Note: This is only for iOS 7.0.0 - iOS 7.0.6.
Step 1. Go to the Settings > iCloud > Account. Here, click on delete password and then input any new password on the iCloud Account Information window, and then click on Done. If the browser prompts any warning, then click on Ok and then on Cancel to exit.
Step 2. Go to Settings > iCloud > Account again, if the Description bar is not iCloud, please input iCloud and then delete it. Click Done. If the Description bar is iCloud, please delete iCould and click Done to exit.
After you successfully reset your password, you can now go back to your iCloud settings and disable Find my iPhone.