To do this, you need to sign in.
To sign in, just click on the copyright notice, in the footer at the bottom of the webpage. There are other ways to sign in, but that’s the technique I use. Once signed in, you’ll notice your name appears at the bottom of the page. If you click on it, you’ll see the page from which you can upload your picture, or change your password. You can also change your email address on that page.