when you make your chart press green flag to play it and there your done! to make a chart just press make a chart and wait till the screen goes away then press g to add left note, h to add down, j to add up and k to add right then press the green flag and your chart will be playable. (if the notes in the chart load too fast or too slow adjust the note loading speed variable in the chart handler default = 0 sprite and redo the chart.)
you can create a chart in this one atleast.. although it is bad here is the worst fnf engine: https://scratch.mit.edu/projects/943922251/