After choosing the keyboard, keytouch will be restarted and the key list will contain the extra function keys of your keyboard.
If your keyboard is not in the list, check the keyTouch website if there is a keyboard file available for your keyboard. For list of available keyboard files go to http://keytouch.sourceforge.net/dl-keyboards.html. Click the "Import..." button after downloading the correct keyboard file. A window will appear where you can select the keyboard file. After this your keyboard will be visible in the list of available keyboards.