The part of the bracket on the upper right section,goes under the nut holding the slingshot plastic. The bottom part of the bracket goes on the the plastic that say"Flipper change Lit lane". Did they send you any screws,to install the bracket on the flipper change lit lane? Hopefully they sent you some kind of self tapping screw.
I hope you can see what I'm talking about,in my not so great picture.If you can't see the bracket,I could turn my machine on and attach another picture.

IMG_20190501_205745521 (1) (resized).jpg

My game came with this already installed,last June.