Not sure exactly what you're asking, but it sounds as if you've made an offer and the Seller (Freddie Mac) has countered and given you a date to accept their offer.
You really should be working with an experienced buyer broker. You may not know it but buying foreclosures is extremely risky, their hardly ever the deal a buyer thinks they are. I've attached a link below to an article I wrote specifically about foreclosures. I have helped many dozens of buyers purchase foreclosure properties over the years, however despite my buying, selling, flipping homes for over thirty years. I have never bought a foreclosure for myself and I'm in the business.
Get yourself some help before you find yourself in over your head.