How do you reposition (break) the very 1st (automatic) mates of you assembly?

I dragged the very first component into my assembly and selected the green check mark. My component popped over to the origin (or whatever SW thinks you want to mate it to), and all was good, fully defined. I proceeded with mating all the rest of my componants. Now I need to change the 1st mates of that very 1st component. I open the mate folder of the 1st componant and the initial mates are not shown, just the mates that occured after.I need to delete the first mates but I can not find them.

Thanks-

SolidworksAssemblies