Usually the presale is specified once you select the event e. g. American Express Gold Card Member presale or 'Such&Such Fan Club' presale. In these cases you would get the password from the sponsor such as AmEx or from your fan club site where you have to have a user-id to login and see the password. Sometimes it's sent to members via email but not usually. I tried to look at Ticketmaster this morning but the 'ticketing system is down for routine maint'... Even if you have to join something you've still got two weeks and it would be worth it to get choice seats. Good luck.
Bill
