Hass.io installation problems or think error?

Hello,

Unfortunately I can’t get any further. I think I am sitting on the tube

I have installed the following image on my RaspBerry PI3

Raspberry Pi 3 64-bit
https://github.com/home-assistant/operating-system/releases/download/5.12/hassos_rpi3-64-5.12.img.xz

Unfortunately there is no Hass.io on the left side.
When I install the File Explorer I can see it.

I would like to add my Xiaomi thermometer.

Can someone please give me a think push.

This is using the Hass.io version or am I thinking completely wrong here?`

Thanks a lot

Do I have a big error in thinking or am I doing something wrong?