Click where it says on the line- e.g. if it says click at 0.6, click where you think 0.6 would be on the line, it will go from 0 to 1. If you get it wrong, a yellow bar will appear on the line showing you where you should have clicked.
The click is measured from the middle of the pointer, so while it may look like you got it, the pointer could just have overlapped. Yes, the thumbnail is me winning on insane mode. It took me a while.
