$30,000 of Pro Assets (Or Game Credit) to trade for Rift VR Blueprint help/info

one little question, the last panel in your image says ‘Set Physics Linear Velocity’ I see thse everywhere in the ‘Motion Controlleer Pawn’ BP… But there is never any way to do anything with it, or to change any variables, if it doesn’t allow one to CHOOSE anything or SET ANY NUMBERS??? It makes no sense to me, what is panel?? Even when I CLICK ON A ‘Set Physics Linear Velocity’ Node in a blueprint, the DETAILS Panel stays PERFECTLY EMPTY, !!! So ,… WHAT??? I feel like i’m gong insane… I can’t understand this, it has no logic, how can you set something, without being able to give any info??? No numbers?? It seems absolutely bizarre, unpredictable and illogical to me, More so every hour… THANKS!