First, you put in set x position to cos, and y to sin.
Then you have 3 blanks in the x, and y places.The first blank in the x place is how far you want the object from its center.
The second blank is the angle or how fast you want it to rotate around the center. Use a value for this, and in a separate rule make the value increase or decrease for however long you want it to.
The third blank is its center x position. It could be anything e.g. 500.
Same goes for the y blanks.
Hope this helped.