Set UserId and Password in the CICS_EpiAttributes_t structure on a CICS_EpiAddExTerminal call. Or, use the EPI function CICS_EpiSetSecurity. This call would typically be used to change the terminal security settings if, for example, the user's password had expired.
Set the userid and password parameters when constructing a CclTerminal class object. Or, use the alterSecurity method of the CclTerminal class.