How do I add a reference to a variable inside of an instance in Blueprints?

Hi, beginner here! I’m following a tutorial and am lost on how to create a Set node with two inputs. One screenshot is the one I have and the other is the one I want. Where would I click to be able to add a reference to the instance set?

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Screenshot 2023-10-21 184414

The second image shows that there is an integer variable “Checkpoint” inside the game instance. The “Checkpoint ID” is inside the current actor.