You should save the certificate into a file and give the name and path to that file to the SSLCertificateFile directive. Remember that you need to add the key file in as well (SSLCertificateKeyFile directive).
PHP Code:
SSLCertificateFile /etc/httpd/conf/ssl.crt/server.crt
SSLCertificateKeyFile /etc/httpd/conf/ssl.key/server.key
that's it