Dumb question: where do you wear the HR strap?

Okay, I still can't figure this out.

Do I put the HR strap underneath my breasts, where my bra band would be? Or do I wear it above my breasts, higher up on my chest?

I know this is probably a really dumb question, but I can't find the answer anywhere!

And every picture I find is of some buff dude without boobies! 

When I was 35 lbs fatter, I *had* "boobies" (well, an "A" cup, as my exgf said :-P ).

The strap goes under your breasts, where the band would go.