[mica123]

I know that similar questions have been asked many times – unfortunately I have not found any satisfactory answers – I very much hope for your help as follows:
I set up Forums on full page widths without sidebars.
I would like to have the login, register and lost passwords links at the top of
the forum page the same way as bbPress Support forum has – I am not referring to menu links.
Can you please help?
Many thanks.

[Robkk]

You can just use the code I posted here. It is more customizable then the other one in the codex article and the other topic you linked to. I might change it in the codex article later on to this one too.

Login, Register, Lost Password links

You can put a custom page like this '/page-slug/'. Here I made it so where when a user logs out they go to a page called “Logout” that has the permalink slug “logout”.

add_filter( 'wp_nav_menu_items', 'rkk_add_auth_links', 10 , 2 );
function rkk_add_auth_links( $items, $args ) {
    if (is_user_logged_in() && $args->theme_location == 'sub-header-menu') {
        $items .= '<li><a href="'. wp_logout_url('/logout/') .'">Log Out</a></li>';
    }
    elseif (!is_user_logged_in() && $args->theme_location == 'sub-header-menu') {
        $items .= '<li><a href="'. site_url('wp-login.php') .'">Log In</a></li>';
        $items .= '<li><a href="'. site_url('wp-login.php?action=register') .'">Register</a></li>';
        $items .= '<li><a href="'. site_url('wp-login.php?action=lostpassword') .'">Lost Password</a></li>';
    }
    return $items;
}

[mica123]

Thanks @robkk – as always.