How to use Game States

How to use Game State?

So according to internet Game State is used to keep track of for example match scores. Good! But how do i use it?

I did so when i kill another player, that player casts to the game state and adds a score for the other player. But it didnt seem to work?

So i tried to Print the Value of the score to see if it changed or not like this:

And nothing happends? nothing at all gets printed to the screen at all? its like it doesnt even exist?
I have added my gamestate to the Project settings > Maps And Modes.

Am i using it in a wrong way? why is it like its not even there? its just dead.

Thanks in advance!

Never mind, I restarted Unreal Engine 4 and now the Game State blueprint works just like any other blueprint!