All bidding is in Bidding Hub ..... preferences can be set on August 10th or live bid on the 17th
Don't forget ..... failure to set enough preferences or live bid will result in being system assigned any open shift at bid close. Also, if your new shift has less than 7.5 hours from your old shift you will be compensated at straight pay for both shifts - there is no "short turn" on a shift bid - see Management to adjust hours if necessary.