Login to Outlook Online and Change Password
Point your browser to https://outlook.office.com
This will take you to the login page:
Enter your Email address and click [Next], you will be redirected to the STS login page:
Enter your password and click [Sign In].
On the following page, Click [Yes]
This will take you to your Webmail.
From there you can change your password by going to the upper right hand corner and clicking on your initials/profile photo. Select [View account].
From the Account Page, click on [CHANGE PASSWORD] in the Password Tile
This will take you to the change password page, enter your old password, and then your new password twice to confirm it. Click the [Submit] button to finalize the process. This tab can now be closed, and you can return to your mailbox.