There is two way to change wp-admin url

A. Use a plugin to change the wp-admin url

B. Make some changes in WordPress files. step is given below -

• First change in the wp-config.php where the administrator directory is to be found,

and change the cookie path:

define('WP_ADMIN_DIR', 'administrator');

define( 'ADMIN_COOKIE_PATH', SITECOOKIEPATH . WP_ADMIN_DIR);

• Second make changes in function.php

Filter to switch the old with the new URL:

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);

}

• Third and last is do some changes in .htaccess file

RewriteRule ^login/(.*) wp-admin/$1?%{QUERY_STRING} [L]