Please check your AUTH token in code and in BLYNK app. Also, look for Serial Monitor under Tools Menu in Arduino IDE, to check if NodeMCU/ESP8266 is connecting or not.
Can you share your code?
Yes, add one more servo.attach(PIN_NUMBER); inside setup() function,considering that you want to control both servos with same slider. Else, create one more Servo variable, read values on another virtual pin from second slider and write this onto the PIN.
For my SG90 servo, Red wire is Vcc, Brown is GND and Orange is COMMAND.
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Thanks John, for finding the pointing the issue. I have made some corrections in code(bolded them). Also, select V3 pin for slider. So, now we shall send rotation value to V3 and nodemcu will write this value to D8 pin.I hope this will work fine.
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