I cannot see my network's SSID (name) on the device screen
a) The first step here would be to refresh the page with available networks several times and going through all the pages - the scan sometimes does not capture every wifi network, especially in a location where there may be many other networks interfering. We have also seen a very small number of cases where the network's SSID showed up on its own after a few hours.
b) If this doesn't help, make sure your router doesn't auto-switch between bands with the same SSID and ideally create separate SSIDs for 2.4 GHz and 5 Ghz. If that's a pain, you can configure a 2.4 GHz guest network with an alternate SSID (you can find how to do both of these in your router's manual).
c) If the network you're trying to connect to is on the correct 2.4 GHz band but you still cannot see it, try power cycling the device (just unplug it and plug it back again) and then unplug your router, leave it off for 1 minute and plug it back in. When your router comes back alive, refresh the list of available networks on your Lattice1 and you should see it.