How to access a certain variable from one blueprint and use it in another one?

hey guys. I have a float variable called “Speed” in my AnimGraph Blueprint which controls the speed of my character. Now I want to Use this variable in my Character Blueprint so that when I press “Shift” I have the ability to increase or decrease the speed; but i can’t access to my speed variable in my character blueprint. what am i missing here? any advice would be greatly appreciated:)