firstly you'll have to break steering lock if a piece of scaf bar is handy or something strong use that as a lever. next you need to take cowlings of and take back part of iggy barrel of and use a screw driver to use as a key, now depending on model, age etc you need to take power to where ever the engine is immobilised so that when you try to start it you'll in effect bypass it probably fuel pump and hey presto should work. we've bypassed a few at work when keys are lost with code in so we normally give reg in to fords and get the right key for locks etc but with no transponder in them for fiver then run a wire from acc on iggy to where ever is immobilised and that works too, pats systems are quite easy to get round.