I've got a view with a form, so when user submits it - could anyone give me a link or a simple example of code Documentation and tutorials for Kohana 3 are so poor against CI .
In Kohana 3.1 you should use Request->post():
Request::current()->post()
or if in your controller:
$this->request->post()
Since Kohana is HMVC, you can call sub-requests with dedicated post data, so using the superglobal $_POST is discouraged, since it's not unique to the request.