Hey @KnightHawk3rd! Welcome to the forums!
On the cube, you should be able to click the static mesh over in the hierarchy on the left hand side of its blueprint, then that will show options in the details. You can change the mesh being used, just change it to the goalpost static mesh! 
To change the actor character, you want to follow this and switch it to your character’s BP. That should be all you need to do!
Hope that helps!
**Thanks for the reply @Mind-Brain **
Just point this out to clarify if what you are suggesting actually would help me or not
The above video shows a 4min tutorial on how to make a basic scoring system
What i want to do with it is - Replace the playercharacter with an actor (ball) and the cube with a goalpost (another actor BP)
what im trying to do- The player pushes(in the sense it presses e and a tracer is fired and the tracer uses add force to push the ball) The Ball into the goalpost and when the ball hits the goal post you get 1+ score in the widget
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