You would highlight the paper size you want, select the orientation, and then click on the [OK] button.
(You; would highlight; the paper size you want) (the paper size; want; you) (You; select; the orientation) (You; click; on the [OK] button; T:then)
You the paper size You You
would highlight want select click
the paper size you want
you
the orientation
on the [OK] button T:then