You may find detailed instructions on How To install the ISOFIX base here:
In the user guide: http://simpleparenting.co/user-guides/.
Europe: page 15.
In the How To Use videos on our website. You may access the videos from the link at the bottom right corner of the home page or from the Support tab at the top menu: http://simpleparenting.co/
Read the instructions on our website: http://simpleparenting.co/isofix-base/