How can i add game time with an overlap event?

I am currently working on a racing game based on the timeattackracer tutorial, where i want time to be added every time the player crosses a checkpoint. However, the furtherest i’ve made it so far was adding time to the beginning of game time. Any help is appreciated.

This is where the time is controlled from
And this is the Blueprint (and obviously non working) for overlap checkpoint to add time.