Not sure if I'm being blind here but on my track that I'm making in the editor, the cars don't seem to be going up laps.. i've set a start line, checkpoints and a driving line down but the race seems to stay on lap one no matter how many times i drive around the track, any help?

Edit: Okay, i worked it out, you have to drag the checkpoint instead of just clicking it on screen. (For anyone else wondering).