All of your listings have bids on them..........You CANNOT add a BIN option.
In all but 4 categories, the BIN option disappears once bidding starts.
BTW: Why in the world would you start any auction at .99 cents? You do realize that if you only get one bid for .99 cents that you will have to sell it for that? OR you will have more problems than you can ever imagine..........
ALWAYS start your auction at the least amount you are willing to accept for that item should ONE person bid and win...........
Also: That buyer violated ebay policy by contacting you:
If the Make Offer button doesn't appear in the listing, the seller isn't interested in receiving offers and you shouldn't try to contact this seller to negotiate price or terms. Doing so violates our offers to buy or sell outside of eBay policy.