The Plugin ge_canonical creates canonical links to avoid no wanted site-internal Duplicate Content.
If you want to know more about canonical links and the negative effects of Duplicate Content, search by google for "canonical link", you will find a lot of informations.
Unzip the zip file and upload the folder "ge_canonical" with all subfolders and files in the plugins-folder of your CMSimple-installation.
Select the plugin "ge_canonical" in the admin area and go to "Plugin-Config". There is only one setting to edit.
You have to decide, if the canonical link shall be created with "www." or without "www.", default is "www.". If the field is empty, the canonical link will be created without "www.".
Following files needs writing permissions:
./plugins/ge_canonical/config/config.php
and all language files in:
./plugins/ge_canonical/languages/
The canonical link will be created only if it is needed on a page, no self references.
For example: If you have set "www." in Plugin-Config, on a normal page called with "http://www.domain.de/?page" will be not created a canonical link.
If you call the page without "www." (http://domain.de/?page) the canonical link looks:
<link rel="canonical" href="http://www.domain.de/?page">