   // After connecting, parameter.getValue() will get you the configured value
   // id/name placeholder/prompt default length
   WiFiManagerParameter custom_ts_token("ts", "Thingspeak Key", auth, 33);
+  WiFiManagerParameter custom_server("serv", "Server", server, 50);
 
   //Use wifi manager to get config
   WiFiManager wifiManager;

        if (json.success()) {
          //Serial.println("\nparsed json");
          strcpy(auth, json["auth"]);

        } else {
          //Serial.println("failed to load json config");
        }

     client.print(postStr);  
  }
  client.stop();
  
  display.clearDisplay();
  display.setCursor(0,0);
  display.print("Vrms: ");
  display.print(Vrms1);
  display.print(",");
  display.println(Vrms2);
