we are using external user DB to log into the Network devices to do authenetication.

I want set enable password on the ACS for the external users, I found from ACS server configuration page:

"Configure Enable Password Behaviour:

For newly created dynamic users, the TACACS+ enable password is authenticated against:

-The internal database.

-The database in which the user profile is held."

I think i should select "The internal database", but i cannot find where to set the enable password in ACS servers?