WARNING: You will need to be connected to the network. Either in the office or connected to VPN.
If you are connected to VPN, stay connected as long as possible after resetting your password so that you do not run into issues.
On your keyboard, press CTRL + ALT + DEL
You should see the screen below (or similar), click "Change a password"
You should then see the screen below (or similar), enter your current password, then the new password twice and press "Enter" (or click the arrow).
You should receive confirmation that your password has been successfully changed.