First you will need to sign up for a NameJet account, which you can do here: https://www.namejet.com/Pages/Login.aspx?
After creating an account, you will add the domains to your list of backorders, which is your indication that you are interested in a name and wish to participate in an auction should the domain become available. Only those customers that have added the domains to their backorder list by the deadline will have the opportunity to register these names.
If the domain is not listed as Pre-Release or Pending Delete yet, you can do this from the "Quick Backorder" feature on the main page of your account.
To learn more about the backorder and auction process, please review: