This method will no longer change your lock screen password since the new kill switch law of 2015. You can still locate your device, SET a password if you don’t have one (it won’t change what you already have one), and erase the device.
This video is about Android Device manager where you can locate, lock or change your PIN, erase, or sound an alarm on your phone. This can be very useful if you forget you password or need to find a lost phone.
Let me know if you’d like to see more of these instructional videos.