Get yourself a copy of FAR/AIM - the relevent section is 61.55.
Find an ATP (rated and current on type) who is prepared to examine you on the aircraft, with special regard to emergency procedures and aircraft systems.
Do 3 take-offs and landings with the ATP, during which you must be the sole manipulator of the controls. One of these must be assymetric.
Fill out the 8710 form, get him to countersign that and your logbook.
Make an appointment at a FSDO in the states (I have this from the IFO in New York, you can't do it over in Europe) and submit the paperwork through them. They will, if you've done it all right, issue you with a temporary certificate until your full one comes back to you.