Hi,
It depends on the UME used for NWDI.
Refer the below help link for UME configuration. YOu need to check into the UME for updating password.
https://help.sap.com/saphelp_nwce10/helpdata/en/da/f812d366aa44ad83a30418b34dae1c/content.htm
Thanks
Imtiaz