Note that you have already created a variable with the name 'count down'. (1) Click the flag. (a) This makes the Sprite visible - as after the count down the Sprite is invisible. (b) the counting down starts at 10 seconds (c) the Sprite will instruct you to click it - and it will wait (2) Click the Sprite and (a) the Speech balloon goes away (b) the count down variable starts and (c) continues losing one second until its value is zero when (d) you see and hear the cat saying 'Goodbye' and (e) it disappears until the green flag is clicked to re-start another countdown.
Seamus O'Neill scratchfromscratch and readysteadycode