First, the extension needs to be installed and configured: see the Configuration section.
Then, you are ready to insert Language Selection page content elements on your pages.
You create a Language Selection page content element the same way as any other type:
select the type Language Selection;
after being redisplayed, the content element creation form should look like the following:
The field “Type of layout” allows to choose the type of layout or presentation: a drop down selection list, a list of flags, or a list of links.
The filed “Languages to select from:” allows you to select languages from the sys_language table. You should include in the list the default language of your site.