The backdrop explains what you need to do. Please contact me of any glitches. To add an item, just find the (+) sign at the bottom. You can add anything you want, just that the project will understand it. There will always be updates coming soon! To play the music that you have created, press the (p) button and hear it.
Please note the presence of the list in the backdrop before clicking the green flag. It's not meant to be there anyway. I first made this in 2014, that's why it's as early as 25 million there. Well, here comes the oldest project in the Scratch Design Studio.