just what you have to do is to tap the flag and enable the camera so you will see yourself
it was so simple to make:- 1-open (video sensing) 2-choose (turn video on) 3-go to (events) 4-choose ( when " green flag " is clicked) 5-put two blocks together thanks to @barkermrad who is actually my scratch teacher on " bright champs" Note: anybody on bright champs would write to me in the comments