Creating keyboard command to second blueprint

Hey, I just started using Unreal and I am having trouble creating a keyboard command that connects to a second blueprint in the scene and activates an animation. It seems to be working just fine with my main blueprint but nothing seems to work on the other blueprint. I have spent the day trying to learn “cast to” and “blueprint interface” but I just can’t seem to get it right. I don’t know if it affects anything, but the second blueprint has a pawn sensing element that allows it to follow the main blueprint within a certain perimeter. I plan on duplicating them. Any help would be greatly appreciated!