How do you make scrolling games like flappy bird? I always get stuck.

Here and here. Hopefully, this helps. And also, the character shouldn't change x AT ALL. Make the obstacles set to Scrollx.

Also, if you are making Flappy Bird, then you don't need scrolling. You need the pipes to

when green flag clicked
forever
    
go to x: (240) y: (0)
repeat (24)
    
change y by (-10)
end

end

So they can move “along” smoothly down the screen.

I have a great tutorial here.

I don't play clash of clans.

Oh, shoot. I'm really sorry man. I thought your post was the clash of clans think. I'm really sorry. Thanks!