Thanks for the link, Jamiee! I apologize for the slow reply.
I’m not seeing any post previews except for on their category pages, but if you’re looking to add a drop down menu that links to your category pages, you can do this under Appearance > Menus…just create the links that you want to show up in the drop down, and then drag them to a slightly indented position beneath the parent menu item that you want them to display under. If you have any trouble doing this, let us know and we can help as much as you need.
The About widget and Subscription widget are elements in the Pro version of Kale, but you can either add a plugin to create your own, or if you’re handy with HTML + CSS, you can just use WordPress’s built in Custom HTML widget and enter anything you like in there. Your mailing list provider probably provides embed code for a subscription form that you can add in a Custom HTML widget as well.
Let us know if you have any questions!