iPHone6 connecting via Xfinity wifi app to internet

Hi,  I am new to smart phone technology (perfer flip phone or landline) & iPhone6.

To avoid excessive data charges, most settings are turned off such as Cellular Data.

My minimum usage requirement:  Wifi calling, Google search over Wifi network, avoiding Verizon network.

What I did:  Downloaded and installed Xfinity wifi iphone app on iPhone 6. After installation completed, found in Settings>General>Profile>Xfinity Wifi:  This app contains 4 Wi-Fi networks.  In More Details>(network 1) Wi-Fi Network(SSID):xfinity.com-ED...4799 Encryption: WPA2.   (network 2) Wi-Fi Network(SSID): xfinitywifi   Encryption: None.  (network 3) WiFi Network(SSID):XFINITY Encryption: WPA2 (network 4) Wi-Fi Network(SSID): CableWiFi Encryption: None

Question:  How to find and connect to the network 1, 2, 3, 4 SSIDs? 

I don't see them on the Home Screen (or right, left, dock and other screens) or under Settings>Wi-Fi under 'Choose An Network'.   

Tried:  Clicking Settings Wi-Fi>Other Network, a keyboard opened.  I entered the SSID 'xfinitywifi' in Name, with Security set to None, then clicked Join.  Error msg: Could not find the network "xfinitywifi"  Dismiss.   

I assume that my Xfinity login/pwd credentials have been saved in the Xfinity Wifi app during download - installation process.

Any assistance to connect to the SSIDs (I assume these are Xfinity public hotspots which I was able to connect from a PC) from my iPhone using Xfinity wifi app is appreciated.  

Thanks in advance.