from main folder to subfolder

Firstly, to remove any confusion, try creating a controller called Test or similar, and in that controller just load a single test view, that has <p>Hello world</p> in it.

Can you link to that page http://www.agri-da.com/cms/test

If you can then the problem is in your code, if you cannot then the problem might be your .htaccess (I presume your server is reading and using your .htaccess file).

Paul.

PS Had a quick look at your page and your form does not submit anywhere, your html is not correct.