Exim and port for sending mail

Question

Helpdesk

It was necessary to add one more port on the server, different from the 25th.
It would seem that everything is simple: exim.conf daemon_smtp_port
But where is this exim.conf? Google throws up its hands.
After three days, my head stumbles on such simple questions. Everything is complicated by the fact that Centos, and I am accustomed to Debian. Can you tell me?
uname -mrs
Linux 2.6.18-194.26.1.el5.028stab079.2 i686

# exim -bV
Exim version 4.69 #1 built 30-Sep-2008 18:26:35
Copyright © University of Cambridge 2006
Berkeley DB: Berkeley DB 4.6.21: (September 27, 2007)
Support for: crypteq iconv() IPv6 GnuTLS move_frozen_messages
Lookups: lsearch wildlsearch nwildlsearch iplsearch cdb dbm dbmnz dnsdb dsearch nis nis0 passwd
Authenticators: cram_md5 plaintext
Routers: accept dnslookup ipliteral manualroute queryprogram redirect
Transports: appendfile/maildir/mailstore autoreply lmtp pipe smtp
Fixed never_users: 0
Size of off_t: 8
Configuration file is /var/lib/exim4/config.autogenerated

#cat /var/lib/exim4/config.autogenerated|grep daemon_smtp_port
#