1) Attach the Suction Cups
Place the suction cups on the top corners of your window pane.
Ensure the velcro side is up and the suction cups are in the furthers point of the window's corner.
2) Install the Curtain
Attach the velcro of the curtain evenly betwen the two suction cup velcro and ensure the curtain is taut so there is no slack.
Remove light bleeds at the top by making sure the curtain fabric is making content with the window pane.
3) Roll in the sides
Roll the excess fabric of the Sleepout Portable inward between the window and the edge and the suction cup.