Important: You can change your password only if your admin has given you permission to update it in Office 365. Contact your admin if you don't have permission to change your password.
If you know your username, and forgot your password
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If your admin has given you permission to reset your password go to, passwordreset.microsoftonline.com.
If you know your password, and you want to change it
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Go to www.office.com/signin and sign in with your account username and existing password.
Note: If you're trying to password protect a Word, Excel, or PowerPoint document, see Password protect files you share in Teams.