Oh, you mean the one in the center of the square? That one requires some precise button pressing. Jump off the high building nearby and glide to it, and if you can get the timing down perfectly, let go of the paraglider and press O. If done correctly, you'll manage to get on top of it, but it requires some precise timing.
If being open to things is a crime, then I deserve the death penalty. Warning, overactive imagination, will come up with crazy ideas at a moment's notice.