(In Info, you only see this section if your terminal has a small number of lines; most readers pass by it without seeing it.)
Since your terminal has a relatively small number of lines on its screen, it is necessary to give you special advice at the beginning.
If the entire text you are looking at fits on the screen, the text ‘All’ will be displayed near the bottom of the screen, on the mode line (usually, the line in inverse video). If you see the text ‘Top’ instead, it means that there is more text below that does not fit. To move forward through the text and see another screenful, press <SPC>, the Space bar. To move back up, press the key labeled ‘Backspace’ or ‘DEL’ (on some keyboards, this key might be labeled ‘Delete’). In a graphical Emacs, you can also use S-<SPC> (press and hold the <Shift> key and then press <SPC>) to move backwards, but this does not work in the stand-alone Info reader (nor in Emacs, if you are using it in a text-mode terminal).