All Dell DRACs come with a default account set up as root / calvin which may be a security risk!
Having Drac5 or Drac6 and racadm installed on one of your servers, you can display your current admin account with this command:
racadm getconfig -g cfgUserAdmin -i 2
When you've made sure that this is the right account, you can change the password using the folling command:
racadm config -g cfgUserAdmin -o cfgUserAdminPassword -i 2 newpassword