Collision between sphere and character

Hello, I’m new to Unreal and Blueprint Scripting. My question is, how does one detect whether the character is colliding with the sphere? So far, I got a sphere collision “Bounding Box” on the sphere itself. Then I clicked on the sphere in the main editor which sent me to the blueprint event graph. One of the nodes I found in the graph is labeled Event ActorBeginOverlap. How can I reference the character in the editor?