It usually comes attached to one of the metal ovals...But for me, I actually take it OFF and just put it inside the bag. I also take the tassel off and save it with the rest of the extra tassels
def. do a search. This has been bought up before and tpfrers have various methods.
I just took the tassel off my bag, tucked it safely in a drawer, and placed the mirror in the front pocket of my city. It seems to be very happy there!