How to update the photo displayed in your account
Log into your account, click your user icon in the upper right hand corner of the dashboard, then select "Profile".
Alternatively, this may also be accessed through the sidebar via "Settings":
Click the "Profile" tab, if it's not already selected. Scroll down to the "User" section, hover over the existing photo, and click the "Browse File" button.
Choose a photo from your local PC (any common image file extension), then click "Save".