When you log in, there's a dark-ish rectangle on the left side, with your user-name, and box below it to enter your password. In that rectangle, top-right corner, is there a circle, or a logo of any kind?
If there is, that's a button. Could you click it, and tell us what you get? Unfortunately, I don't know if there is even a way to do a screenshot of that, so a detailed description would be helpful. IF there is such a circle/logo to begin with.
"I fear the day technology will surpass our human interaction. The world will have a generation of idiots."
― Albert Einstein