Some of our screens on the Trainer side are designed with buttons at the bottom of the screen. In our "Light box" screens (with the grey background) you might not be able to navigate out of the page without the buttons.
If this happens to you, just maximize the size of your browser and then refresh the page. More than likely, you will be able to see the buttons at the bottom. We tend to see this issue with people who do not operate their browser at full size.