You have no olcRootDN listed for your configuration database, which, as I understand it, means you have no capability to modify your config using ldapadd. For a solution, see:
http://www.openldap.org/lists/openldap-technical/201211/msg00195.html
The above instructions seem to be dangerous as it involves direct editing of /etc/ldap/slapd.d. Is it the best way.
Also, what is "<edit the ldif>". Does something like the following work?
https://help.ubuntu.com/13.10/serverguide/openldap-server.html
# Accesslog database definitions dn: olcDatabase={2}hdb,cn=config objectClass: olcDatabaseConfig objectClass: olcHdbConfig olcDatabase: {2}hdb olcDbDirectory: /var/lib/ldap/accesslog olcSuffix: cn=accesslog olcRootDN: cn=admin,dc=example,dc=com olcDbIndex: default eq olcDbIndex: entryCSN,objectClass,reqEnd,reqResult,reqStart