NOTE: If remote (Offsite away from the office), make sure you are logged into VPN.
1. Open a browser and go to www.office.com, and sign-in with your work account.
2. In the upper-right, click on the gear, and then under "Password," click on "Change your Password" (See the red boxes in the image below).
3. Once you click on "Change your Password," a new tab will open up for you to change you're password.
4. Create a new password and confirm it.
5. Click "Submit" to finish and change your password.