How do I upload or replace my profile picture?

Click "My account", then click the "Edit" tab. Scoll down to the "Picture" section.

To upload your profile picture click the "Choose File" button, select the picture, then click "Save" button.

To delete an existing profile picture: check the checkbox "Delete picture", and click "Save" button. (BTW, you cannot delete the default profile picture, which is the one showing in above image. You can replace it with yours.)