To scroll up and down on any page, click on the tiny Up and Down Arrows alongside the right edge of
that window.
You can also click & drag the tiny sliding button that travels up and down on the scroll
bar.
When that sliding button is at the top of the scroll bar, you are at the top of the page.
When the sliding button is at the bottom of the scroll bar, you are at the bottom of the page and cannot scroll
down any further.