display alternate menu

See https://codex.www.ads-software.com/Function_Reference/wp_nav_menu#Different_menus_for_logged-in_users

thanks! Where do I add that code?

first you have to register both the menus in theme’s functions.php file.
below is the code for register menus.

register_nav_menu( 'logged-in-menu', __( 'Logged In Menu' ) );
register_nav_menu( 'logged-out-menu', __( 'Logged Out Menu' ) );

And then find from where the the extsting menus are displaying.
mostly it is in theme’s header.php file.
find wp_nav_menu function in header.php file and Replace with below code

<?php if ( is_user_logged_in() ) {
     wp_nav_menu( array( 'theme_location' => 'logged-in-menu' ) );
} else {
     wp_nav_menu( array( 'theme_location' => 'logged-out-menu' ) );
} ?>

Still can’t get it to work. Is there something really basic I’m missing?