Can anyone help me with Thumbnails? This is the script i Have used

when green flag clicked

go to front

hide

The thumbnail set for your project is whatever is on the screen when the project gets saved. You have to ensure the screen shows the thumbnail you want when you save. If you've got a sprite that you want to show as the thumbnail, just manually show it and then click save.

The only script you need is one to hide the thumbnail when the project is started.

Try

when green flag clicked
set [ ghost ] effect to (100)
go to front

when I receive [ please help me]
ask [With what?] and wait
if <[I can help] = [true]> then
set [ helping ] to [true]
if <[bad day]> = <[true]> then
Set [helping] to [false]

when green flag clicked
WANTS YOU TO CHECK OUT MY GAMES IMPACT AND THE NEW APPEL Apocalypse 
End