How to change the password for the "Administrator" user in Windows Server?

To change the administrator account's password, connect to your server remotely through Remote Desktop (RDP) and follow the steps below:

1- Click on Start > Server Manager.

2- Click on Tools > Computer Management.

3- On the window that appears, open : Local Users and Groups.

4- Then click on Users.

5- Right click on Administrator then click on Set Password...

6- On the alert that appears, click Proceed.

7- Enter your new password, confirm it then click on OK.

You will find in this article some tips for choosing strong passwords and thus protect your accounts: How to choose a strong password?