CONTENTdm uses OCLC LDAP accounts for authentication. The following link can be used to reset a password: https://ldap-accounts.oclc.org/forgot
If you are still having difficulty with your OCLC LDAP account, please email OCLC Support.
If a CONTENTdm username starts with a CDM\admin or CDM\user these are considered legacy accounts and can no longer be managed. See adding new users here for more info.