If you couldn't follow all the steps listed in this article: "Connecting your evaSMART to the Internet", the problem can be in your router choosing 5 GHz band connection over 2.4 GHz.
evaSMART only uses 2.4GHz band connection, please kindly make sure your local Wi-Fi is of that type and not the 5GHz or 2.4GHZ+5GHz one!
To do that please check your router settings by typing either 192.168.1.1 or 192.168.0.1 in your internet browser, hit enter and type "admin" in both login and password fields of the form you'll see (or "admin" as login and "1234" as password). Then go to the wireless settings page (should be called something like "Wireless settings" or "Wireless network settings") and check if the connection is the 2.4GHz band one.
In case those pairs didn't work, please check if the one for your router is printed on its bottom. If it's not, do look up your router's info on its brand's website.
You might also want to make sure there are no special characters in the network's password and SSID.
If connecting to routers wasn't successfull, please kindly do the following: use one of your mobile devices as a hotspot (4g) and try connecting to that network using the other one (preferably an Android one).
In case you're using an Android device to connect, the app's version is previous to 1.1.3 and you're getting a "No Wi-Fi networks detected" error message, please make sure the GPS/Location is enabled (either from you notifications bar, or in Quick settings, or in Settings => Privacy). Please check if it is, enable if it isn't.