Summary
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Some sites with the Jetpack plugin enabled do not have a link in the Dashboard Sidebar.
Our developers are aware of the problem and are working on a fix.
Workaround
The Jetpack settings can be accessed from the Plugins screen:
Clicking on the Settings link under the Jetpack listing will take you to the Jetpack settings.
Unfortunatly there is not a link to the Auto Reply page which allows you to reply automatically to contact forms. You can find that by adding /wp-admin/admin.php?page=jetpack_auto_reply_settings
to the url of your blog.