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<?php
// 1 - Add constant to wp-confing.php
define('WP_ADMIN_DIR', 'adm1986');
define('ADMIN_COOKIE_PATH', SITECOOKIEPATH . WP_ADMIN_DIR);

// 2-Add below filter to functions.php
add_filter('site_url', 'wpadmin_filter', 10, 3);

function wpadmin_filter( $url, $path, $orig_scheme ) {
  $old = array( "/(wp-admin)/");
  $admin_dir = WP_ADMIN_DIR;
  $new = array($admin_dir);
  return preg_replace( $old, $new, $url, 1);
}

// 3- Add below line to .htaccess file
//RewriteRule ^adm1986/(.*) wp-admin/$1?%{QUERY_STRING} [L]

// 4 - Access
//Now your admin URL will be like: http://www.yourdomain.com/adm1986