For Control Panel (2022 release)

1.  After you login, Click the "My Dashboard" tab from the side menu
2. Click The "Profile" tab form the side menu
3. Add your profile image here and click the save button

For Classic Site (pre 2022 release)

1. After you login, from your home landing page, click My Account in the upper right-hand corner. 
2. Under Profile Photo, click Add/Edit Photo. When finished, select the Save button.