Zorin os 16.3 lite not showing wireless internet and icon, just showing Ethernet

Everything there looks fine. You do not need to fill in all fields.
Can you right click on your panel (taskbar) and under Panel slide over to Panel Preferences. Move to the Items tab.
Click Add.
Select Status Notifier Plugin and add it to the panel.

If you want to keep it, you can position it where you want on the panel with the up and down arrow icons on the right side.
Now, you should see a Network Manager Icon on the panel.
Left click that Network icon and look for your WiFi Listed under Wifi Networks. If it is present, click on it to connect to it.