[Solved] link to the BuddyPress profile

@tazar,

This code should work fine:

if (!function_exists('custom_url')) {
    add_filter("wpdiscuz_user_settings_button", "custom_url", 10, 3);

    function custom_url($html, $currentUser, $currentUserEmail) {
        if (!empty($currentUser->ID)) {
            $user_url = function_exists('bp_core_get_user_domain') ? bp_core_get_user_domain($currentUser->ID) : '';
            if ($user_url) {
                $wpdiscuz = wpDiscuz();
                $html = "<div class='wpdiscuz-user-settings  wpd-not-clicked' wpd-tooltip='" . esc_attr($wpdiscuz->options->getPhrase("wc_content_and_settings")) . "'  wpd-tooltip-position='right'><a href='$user_url'><i class='fas fa-user-cog'></i></a></div>";
            }
        }
        return $html;
    }
}

Put it in the active theme functions.php file. 

This article helps to add a custom code to your website: How to Easily Add Custom Code in WordPress (without Breaking Your Site)

@tazar,

We'd really appreciate if you leave a good review on the plugin page.
This is the best way to say thank you to this project and the support team.