If you look how I fixed your example, it now has an x in the condition. Right click on the condition and you'll see the option "invert". To invert a condition means when it's opposite it is true. In your case it means when "Is scored" is false.
Another point to note is in your events you set the "is scored" to true but in this case that isn't needed because every time a new sprite is created, it's created with the value of false. If the situation was different and the same exact sprite stayed on the layout, then changing it to true at the of the events would be appropriate.
Understanding how to use variables takes a little time to get your head wrapped around them. Your on the right track and I'm sure with practice you will learn to use them successfully.