Start by pressing green flag. By clicking on the numbers, you can change their value. To edit the time signature, click on one of the numbers and press the up/down arrow keys to select the number you want. When the numbers are how you want them, press enter to view the length of a song with the parameters you have put in. I don't plan on updating this project, but if there are any bugs, tell me in the comments and I will do my best to fix them. I hope this is useful to you, @zfn
