Please refer to the following steps to change the Administrator User Password of Windows 2016 Server.
- Log on to the computer using the Administrator user and click on the Window button left the bottom corner.
- Select the Administrative tools and click on Computer Management.
- Click on Local Users and Groups >> Users
- Right Click on Administrator User and click on the set password button.
- Enter the New Password and Confirm Password and hit OK Button.
Now, you can log in to your VPS with the new Password.