If you want to add or change your profile picture, you can do this via your employee profile.
Click on your name on the top right, then click My profile.
Make sure you are on the employee tab of your profile menu.
Click on the camera icon next to your current profile picture.
If you don't have profile picture yet, your initials show instead.
Click Upload new image.
Browse and select your new image to be your profile picture, then click Open.
Your new profile picture shows.
Scroll to the bottom and click Save.