How to overide a view in a new module?

Hi, I’m learning how the Yii framework works.

I work on Humhub and I need to overide the login behavior (view and controller).

I’m lost in what I have to do?
I created and activated my module according to Yii conventions, except that I can not understand how to overload my view?

The native view is in humhub / modules / user / views / auth / login.php
I would also like to modify the behavior of the controller method humhub / modules / user / controllers / AuthController / actionLogin

Thank you for your help, I am lost

its seems that your problem is rewrite yii structure folder