You clip it to the drip edge that's at the top of the bunk. You don't need to go all he way to the center,just go as far as you can reach. They send you the "red" clips but I don't feel there quite strong enough so I bought these colorful clips at Target for a little over $1.00 I think and they work great. Bought 2 pkgs. and use 6 clips per bunk. I have 4' aluminum ladder that I take with me to close up the ends at the end of our stay and to clip the gizmos up.