-Press the Green Flag, then the arrow keys.- This is a simple tutorial I created explaining how to remix your own project. I'm sure there are others out there, but many use an old method that's now outdated. If this doesn't work, let me know. Also: try reloading.
Everything's by me, but I learned how to do this from somewhere ( I didn't figure it out myself.) I don't recall exactly where, but it was on the forums..