The Jetpack menu should appear as soon as the Jetpack plugin is active on your site. Could you go to the Plugins menu, and make sure the Jetpack plugin is active?
Once you’ve done so, you should see the menu appear right above the Posts menu item. You will then be able to connect Jetpack to your WordPress.com account by clicking on the Connect button appearing at the top of the Jetpack page.
Once your site is connected, there are different ways to access your Site Stats:
- You can click on “View All” in the Stats dashboard widget appearing under “Dashboard” in your dashboard.
- You can click on “View Old Stats” in the new Jetpack dashboard, under “Jetpack” in your dashboard.
- You can click on “View More Stats on WordPress.com” on that same page to view the new Stats page with even more detail than the old page.
- You can click on the Stats graph appearing in the admin bar when viewing your site.
I hope this helps!