Im assuming its windows and it wont allow you to do that. its a part of their policy.
You can change your password as an administrator. Found these steps online.
Boot your computer and immediately press on the F8 key repeatedly until your computer displays the boot menu.
With the arrow keys, choose Safe Mode and press the Enter key.
On the home screen click on Administrator.
If you have no home screen, type Administrator and leave the password field as blank.
Click on the Start menu in the bottom left corner, go in the Control Panel, then in User Accounts you can change any user passwords easily.