You are not able to make changes to Apache webserver configuration via a httpd.conf file. There is a default httpd.conf file already in place for a default configuration for all customers. To make changes to the webserver configuration, you will need to create a .htaccess file.
Using this method you can make specific changes to the webserver configuration such as enabling file/folder listing publicly, define custom error pages, redirect incoming traffic, etc. In this way, you can make changes that will only affect your websites. The .htaccess file is recursive meaning that the configuration settings within the file will apply the the folder where the .htaccess file is saved as well as subfolders and files.
The following is a list of directives which can be used in a .htaccess file:
|ErrorDocument||Define your own custom error pages|
|AddType||Assign a MIME-Type to a file ending|
|RewriteEngine||Activate mod_rewrite module|
|Allow/Deny||Host or IP based access control|
|FilesMatch||File based access control|
|AuthType||"Basic" password check|
|Redirect||Redirection to another page or site|
|Options||(de)activate index, symbolic links, etc.|