At the top right side of your keyboard, just to the right of the "<--- BACKSPACE" button, is a button labeled "HOME."
Press that, and the screen will roll instantly to the top. If you press the button just below that one, labeled "END" the screen will roll to the bottom.
These buttons can be used in any software you have open, such as this forum, or a document that you are writing or viewing, or a website that you are visiting.
Alternatively, at the extreme right edge of this and all the other pages, there is a thin column with a gray "elevator" in it that indicates where you are, relatively, on the page that's open. At the very top (and bottom) of the "elevator shaft" are very tiny arrows. If you place the mouse pointer on the little arrow at the top, and press & hold, the screen will roll to the top, and will roll to the bottom if you use the bottom arrow.
