You need to create that variable. All Variables in UE4 have a Get and a Set functionality. Most of the the Set and Get boxes you see in pictures are variables. So you can either go to the Variable Section to the left in the Blueprint Window, Click the Plus and choose the variable type of choice (your pawn for example). Or you can right click on every output node of a Blueprint Action and choose Promote To Variable, then it will get the same type as the output node.