Here, I think this is what you asked for. Just copy paste those screens into the full activity.
I think that the activity could definitely be designed to be modified easier, but anyways, here are the values you need to edit if you need to do more:
Note: when you’re editing the graph, the lines won’t show as changed - you need to preview to see them. This also applies to when you’re editing the location of the labels. I just guess-and-checked my way to a decent location for them.