That’s to be expected. You installed the docker version of Home Assistant, not hassio. That’s why hassio tab is not there. AFAIK, you can’t install hassio on a QNAP NAS.
Since hassio is basically just a docker install, would it be possible to somehow install the supervisor alongside the docker hass install and somehow link them together to get the benefits of hassio? There’s got to be someway to make this happen.
Thank you. The “Welcome Home” notifications that appear on the home screen after the installation is completed suggested (to me, at least), that this was in fact Hassio I had installed. The “Configuring Home Assistant” link that the install places (front and center!) on the home screen leads you right to installing Add-Ons as a first step … as if I should have been able to do that. As I am a newb’ in the Linux world, I’ll probably just see how far I can go without Hassio, and not mess with learning manual install commands that other replies suggested (might) work. Seems like there is a lot I can do with this container install and a text editor to get me started!