Sharing variable values between Blueprints

Thanks,i’ve seen the video,but still i can’t resolve my problem.
All i want to do is to read the value from the “Scalability Value” variable (Created in the Pause_Menu_Option class) in the Pause_Menu_Apply class,that’s it.
Also,i get this “Accessed none… from node…” error wich means that the “Scalability value” variable called from the Pause_Menu_Apply blueprint is null.That’s my question: How to read an integer (or string,or whatever i want) from another blueprint.
Sorry if i might be rude,but really i’ve seen everything and still i can’t resolve this problem.