Choose Yes if the lottery draws a bonus number (so called powerball number) from a separate pool of numbers than the main numbers. The bonus/powerball number than may match a main number. Usually you have to match all main winning numbers and the powerball number(s) to win the jackpot. The next step is then the range of powerball numbers.
Choose No if the bonus number(s) is drawn from the same pool as the main winning numbers and the bonus number can never be the same as a main number. Usually you have to match the main winning numbers only to win the jackpot. The next step is then the selection of draw days.