You should have a mounting bracket that screws to the metal fan box (Yes, I said "METAL").
If you do not have a metal box that states "FAN" on it, you are risking having the fan crash down and having the wires contact each other and cause a fire.
Now back to the bracket, it should be metal, and have two arms that come down to hold the ball at the end of the fan rod.
The cover should screw into the side of the bracket near the ceiling.
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