To extend: pull the roller sunblind out by tab 1 and hook it onto retainers 2 at the top of the window.

Always guide the roller sunblind by hand.
Do not let it snap back suddenly as this would damage the automatic roller mechanism.

Do not drive the vehicle with the roller sunblind hooked in and the side windows opened simultaneously. The roller sunblind can jump out of the retainers and spring back suddenly when driving at high speeds, e.g. when driving on the freeway. This could damage the inertia reel. Therefore, either close the side window or retract the roller sunblind before driving at high speeds.