Following instructions on https://premium.wpmudev.org/manuals/using-wpmu-dev/installing-the-wpmu-dev-dashboard-plugin/
I have installed but cannot find the link to do the very important step as this text / link is not on the page...
There is one more very important step to complete before you start exploring the Dashboard features though: you must enable your site to obtain automatic updates, one-click installations, and direct support through the WPMU DEV Dashboard plugin.
You’ll see a prompt to do just that at the very top of your screen:
Click the highlighted text to be redirected to the page here at WPMU DEV where you can enable your site for all the goodies: Update Notifications Sites.
Once on that page, click the “Enable” button at the far right of the row corresponding to the site you want to enable.