Key blade entry
Hi
The key blade entry system is built into the left hand door handle, You have to insert the narrow part of the blade into the hole situated on the underside of the handle, this pops the plastic cover off, allowing you to see the lock.
The manual warns against pulling the cover off, the actual key releases the plastic cover.
Lots of information plus diagram on page 54 of the PDF version of the manual, as usual you have to read 3 or 4 separate pages until you track down the useful one.
If you have the pdf version use the "find" option and search for key blade.
Hope this helps.