Does it really works?

Hello !!!

I've already installed this plugin:
/all-in-one-seo-pack/ to /wp-content/mu-plugins
all-in-one-seo-pack.php to /wp-content/mu-plugins
simple-sitemaps.php to /wp-content/mu-plugins
sitemap.php to /wp-content

.htaccess modified

I do not appreciate anything. No new option in the menu. No sitemap.xml found. Nothing at all.

How could i verify this plugin is really working well?

Thanks in advance