Note, that they can only change your Apple ID Password, if you have given them your current password. Since you have given control of your device to someone else, you will most likely be forced to prove the device is actually yours and will have to remove the Activation Lock that was created with the new Password if you are unable to reset it. First start by attempting to reset the Password using 1 of these 3 methods:
If you forgot your Apple ID password - Apple Support
If you are unable to do that, then provide your purchase receipt from Apple or Authorized Apple seller to remove the Activation Lock.
How to remove Activation Lock - Apple Support