What you’re going to want to do is Cast to the blueprint that contains this function. You have the function Puzzle 1 Solved contained in the blueprints for the wall. So in the blueprints for the Puzzle_1_Trigger_Blueprint you will have to add a Cast To Puzzle_1_Wall_Blueprint after F is pressed. Then you would add in the Call Function node and instead of the target connecting to a different variable you would add it to the “As Puzzle_1_Wall_Blueprint”:
This is a recreation of your function. Which I have placed in the blueprint Actor_Apple:
And this is how you would call to that function from another blueprint. Use the “cast to” node which you would obtain in your case just typing in Cast to Puzzle_1_Wall_Blueprint. Use the get all actors out of class node and the “Get” node for the object. And then you’ll notice that the call to function is connected to the “As Actor_Apple”.
And lastly, you’re going to want to have enabled the ability to have inputs in the blueprints for something that is not a character blueprint so pressing this button will actually work:
