Apache configuration files are usually stored in /etc/httpd. The main configuration file is usually called httpd.conf. In most cases you will find the sections at the end of this file. In rare cases, the blocks are stored in a separate file in a directory such as /etc/httpd/vhosts.d/ or sometimes in /etc/httpd/sites/ or in a file called "ssl.conf".
SSLCertificateFile should be the main certificate file for your domain name
SSLCertificateKeyFile should be the key file you generated when creating the CSR.
SSLCertificateChainFile should be the intermediate certificate file we received from you.
Apache Support: https://cwiki.apache.org/confluence/display/HTTPD/FAQ
Creating an SSL Certificate with Apache+mod ssl : http://slacksite.com/apache/certificate.php
Apache + SSL on Win32 systems HowTo: http://tud.at/programm/apache-ssl-win32-howto.php3