The following example shows how "myextension" can be added to a currently running Exponential installation:

Put the extension into the extension directory
Assuming that you've obtained an extension that is called "myextension";
copy the new extension to the "extension" folder in the Exponential root directory.

cp myextension-[version].[subversion].tar.gz /path/to/exponential-dir/extension/

Extract the extension
Go to the folder 'extension' and unpack it:

cd extension

tar -zxfv myextension-1.0.tar.gz

After unpacking, the .tar.gz file should be removed (since it is not needed anymore).

Copy the settings.append file
Copy the settings-append file (myextension.ini.append) from extension/myextension/ to the Exponential settings-override directory (settings/override/). If myextension.ini.append already exists then simply add the lines from the recently unpacked override file at the end of the existing one.

Access configuration
Access to the new extension can be configured from within the settings/siteaccess/myaccess/myextension.ini.append file.

Enable the extension
In settings/override/site.ini.append you have to make sure the extension is loaded :

[ExtensionSettings]

ActiveExtensions[]=myextension