Once you have a hosting package in your account, the Dynadot Hosting box shows up.
To quote 'mashahood_niz' in another post: "Before buying I would like to remind you that you wouldn't be able to use Databases, PHP and/or other Server Side Languages"
Also, in the Help section answer above, the "Click on the link listed in the "Name Server" column. " step is referring to the Name Server column that is below the 2 rows of buttons. The link name is what your domain is currently set to like "Dynadot Revenue Parking", "Stealth:http://...".