For most implementations, the default password is set to "changeme". This password is automatically assigned to all new team members; in addition, when you reset a user's password, aACE reverts to this password.
System administrators can update the default password: Navigate to Menu > System Admin > Preferences > Database Management. In the Database Management section, click into the Default Password field. The current password displays. After you type in a new default password, click Commit Updates.