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1.

Citadel Home Directory

2.

Enter the full pathname of the directory in which the Citadel
installation you are creating or updating resides. If you
specify a directory other than the default, you will need to
specify the -h flag to the server when you start it up.

3.

Enter the subdirectory name for an alternate installation of Citadel. To do a default installation just leave it blank.If you specify a directory other than the default, you will need to
specify the -h flag to the server when you start it up.
note that it may not have a leading /

7.

Enter a password for the system administrator. When setup
completes it will attempt to create the administrator user
and set the password specified here.

8.

Citadel User ID:

9.

Citadel needs to run under its own user ID. This would
typically be called "citadel", but if you are running Citadel
as a public BBS, you might also call it "bbs" or "guest".
The server will run under this user ID. Please specify that
user ID here. You may specify either a user name or a numeric
UID.

11.

Please specify the IP address which the server should be listening to. You can name a specific IPv4 or IPv6 address, or you can specify
'*' for 'any address', '::' for 'any IPv6 address', or '0.0.0.0'
for 'any IPv4 address'. If you leave this blank, Citadel will
listen on all addresses. This can usually be left to the default unless multiple instances of Citadel are running on the same computer.

12.

Server port number:

13.

Specify the TCP port number on which your server will run.
Normally, this will be port 504, which is the official port
assigned by the IANA for Citadel servers. You will only need
to specify a different port number if you run multiple instances
of Citadel on the same computer and there is something else
already using port 504.

15.

Please choose the user authentication mode. By default Citadel will use its own internal user accounts database. If you choose Host, Citadel users will have accounts on the host system, authenticated via /etc/passwd or a PAM source. LDAP chooses an RFC 2307 compliant directory server, the last option chooses the nonstandard MS Active Directory LDAP scheme.
Do not change this option unless you are sure it is required, since changing back requires a full reinstall of Citadel.
0. Self contained authentication
1. Host system integrated authentication
2. External LDAP - RFC 2307 compliant directory
3. External LDAP - nonstandard MS Active Directory

For help: http://www.citadel.org/doku.php/faq:installation:authmodes

ANSWER "0" UNLESS YOU COMPLETELY UNDERSTAND THIS OPTION.