How remove index.php in my permalink

Hai all,

I’m sure a lot of wordpress user have similar problem like mine.

I need help to resolve a problem i had with my multisite website https://www.lynxhexagon.com.

Problems i’m facing now:-

1. URL with double forward slash with i’m in admin dashboard (https://www.lynxhexagon.com//)
2. My website URL permalink keep showing index.php/, how can i remove the index.php/? i just want my URL link showing https://www.lynxhexagon.com/about-us without the index.php.

I am having multisite. below is my config files.

/* Multisite */
define( ‘WP_ALLOW_MULTISITE’, true );
define(‘MULTISITE’, true);
define(‘SUBDOMAIN_INSTALL’, true);
define(‘DOMAIN_CURRENT_SITE’, ‘www.lynxhexagon.com’);
define(‘PATH_CURRENT_SITE’, ‘/’);
define(‘SITE_ID_CURRENT_SITE’, 1);
define(‘BLOG_ID_CURRENT_SITE’, 1);

/* That’s all, stop editing! Happy blogging. */

/** Absolute path to the WordPress directory. */
if ( !defined(‘ABSPATH’) )
define(‘ABSPATH’, dirname(__FILE__) . ‘/’);

/* WordPress MU Domain Mapping */
define( ‘SUNRISE’, ‘on’ );

/** Sets up WordPress vars and included files. */
require_once(ABSPATH . ‘wp-settings.php’);

/** Sets up WordPress disable editing from Dashboard. */
define(‘DISALLOW_FILE_EDIT’, true);

My permalink using

/%category%/%postname%

Please help.