Separate the tulip face from the mounting bracket. The two pieces slide apart in the center. Usually there is a stop screw that you need to unscrew.
Position the bracket so that the slide is at the bottom of the bracket. The upright portion of the bracket has two screw holes. Place the bracket diagonally and 4 inches away from the corner of the top window casing.
Screw the bracket into wall anchors using a screwdriver if your screw doesn't touch a stud. Repeat for the second corner. You can add additional swag holders around arch top windows. Evenly space your holders at least 24 inches apart so that your fabric rosettes will not crowd each other.
Slide the two pieces of the swag holder together, and then screw in the set screw. Adjust your swag holder to the distance you want away from the wall surface. Tighten your screw.