How to use theme switcher?

[saccori]

I'm using GetSimple 3.2.1 (latest version), i should like to allow users to switch from several themes.
I visited the Theme Switcher page (http://get-simple.info/extend/plugin/theme-switcher/248/) on GetSimple Extend section but i do not understand all the details for the correct use of this plugin.
Can anyone explain me (it should be better with an example) how can i use this plugin ?

In particular i DO NOT UNDERSTAND these points:

all templates configured in any page must exist in all themes. If there is a functions.php in a theme, it must be the same in all themes Add links (or a form) to your template to allow the visitor to switch themes: To temporarily (user session) switch to a theme (here Cardinal), use a link ...?settheme&theme=Cardinal

What exactly must i do? What must i insert before ...?settheme&theme=Cardinal? What means "all templates configured in any page must exist in all themes"?
Thanks for collaboration and excuse for my incompetence...

[mvlcek]

In particular i DO NOT UNDERSTAND these points:

all templates configured in any page must exist in all themes. If there is a functions.php in a theme, it must be the same in all themes Add links (or a form) to your template to allow the visitor to switch themes: To temporarily (user session) switch to a theme (here Cardinal), use a link ...?settheme&theme=Cardinal

In a theme you can have multiple templates (e.g. one template for the home page and another for all other pages) - if you don't change (or can't change) the template in the options of a page, you are fine.

Some themes contain a functions.php file. You might have problems, if these files differ beween themes.

Just add the above parameters to your page URL, e.g. http://my.host.com/?settheme&theme=Cardinal

[Oleg06]

Try to open all themes and click on the demo and responsinator
http://getsimplecms.ru/temy/besplatnye-temy/