You can add or change your profile photo in Office 365 from Office.com, or while using Office 365 applications on your computer or in a browser on your phone. Your photo will appear everywhere there's a profile photo circle in Office 365.

To add your profile photo to Office 365 for business 

1. Find a photo you want to use and store it on your computer, OneDrive, or other location you can get to. The photo needs to be smaller than 4 MB and can be a .png, jpg, or .gif file.
   

2. Sign in to Office 365 account at office.com.
   

3. 

   Unsure about login process. See How to access Office 365 via the Web

4. Select the circle in the upper right hand corner of the page that shows your initials or an icon of a person.  
   

   
   

5. In the My accounts pane, select the circle that shows your initials or an icon of a person. Change your photo in the pop-up that appears.