If you have reflex mix a wingtip spin is really easy. Reflex is when the ailerons are mixed with the elevater to move in the same direction.

On a down line roll to either direction then pop in opposite rudder and full down. You may need to add throttle to get it to rotate. This could also put you in an inverted flat spin. Just add more throttle and it should go into a wingtip spin.

You will have to experiment using different stick combos and timing. I have only given you a base as different models will do this differently. This is how i have been doing the KE spin with my Seduction Freestyle, the thing will spin in positions that don't seem to be possible. Don't give up and keep trying?

What model do you have? Some one might be able to tell you how they were able to do the KE spin with that model.