Computer Science Homework Help

Hello, I need help with updating my space game I need to fire a missile and make it disappear. I have tutorials that will help with fixing the glitch as well with demonstrations on how to properly complete this task. That way the issues get resolved. I need it completed by Monday before midnight. I have plenty of tutorial videos that will help as well. The issue I am having is the f key is not firing at all I will give you the file from where the previous tutor left off .