(ok so i lied...sue me!) This part is a little hard to understand.
Step 4: The easier part
from this point on it gets alot easier. All you do is flip the plane over and fold the tip down...then flip the plane over again and crease half the bottom section then tear it off. this will be the start of your tail.
Step 5: The wings
now you are almost done!!! after the wings are folded add your newly made tail into the plane and then your done!!!