I don’t see the serial pins in the pin selection,blynk seems amazing but how can i not use hardware serial
In what capacity are you looking for??
Serial, either Hardware or Software, is utilised in many different ways:
As a way of linking an ESP (as a simple WiFi transceiver) to an Arduino, thus giving the Arduino WiFi capability…
http://help.blynk.cc/how-to-connect-different-hardware-with-blynk/arduino/esp8266-with-at-firmware
Serial is used in your sketch to send debug data to a IDE monitor on the PC…
Or even simple serial prints for your own purposes to the IDE monitor
Perhaps even as a communication method between hardware devices…
However, there is no need or benefit to “control” Serial ports directly via the App.