You have to get a small philips screwdriver and remove the barrel from the door handle assembly out from the inside of the door.
Open the door and sit on the sill so that your at the right level. There are two small screws that hold the lock barrel assembly in place, undo them and slide the back of the barrel off. They might be masked by the rubber water cover over the back of the barrel.
Then pop the barrel out and then you'll find the handle assembly will come out.