Blanche and Dorothy enter into an agreement for the sale of Dorothy’s lawn furniture. Blanche, the purchaser in the transaction, pays Dorothy with a check for $500. The check reads: “Pay to the Order of Dorothy Zbornak”. A few days later, Rose offers Dorothy dog walking services for $250 a month. Dorothy decides to pay for two months in advance and gives the $500 check she received from Blanche to Rose as payment for the dog walking services. What did Dorothy had to have done to the check in order for Rose to be able to present this check to Blanche’s bank and demand the cash payment?