responsive menu

I need adapting the layout menu to mobile and tablet gadgets.
I have two default menu on the website (theme EcoTour) and 3rd is additionally more.
this is how to look ...
http://fileth.pl/wp-content/other/2respons_menu.jpg
http://fileth.pl/wp-content/other/1respons_menu.jpg
3rd menu is vertical menu on the right site and have some banners will be links to site.
In the mobile and tablet gadgets 3rd menu is not visable.
I wont to do see 3rd menu as well as the second and third menu on the mobile.

Hi!

These drop down menus are displayed thanks to the function "smt_mobile_menu($menu_name)" that is registered in functions.php file and invoked in header.php. You have to register your own menu in functions.php and insert your own code right after:

<?php smt_mobile_menu('sec-menu'); ?>
<?php smt_mobile_menu('main-menu'); ?> 

into header.php located inside the directory of the theme.
This article will be very helpful for you: https://codex.wordpress.org/Function_Reference/register_nav_menus.