Implementation of DIY Manual Support Request

So I altered the void setup to include the Serial.begin(SPEED); and the Serial.print("Ada/n"); in the void setup and it gives me a new SPEED was not declared in this scope.

void setup(){
  delay(2000)
  LEDS.addLeds<APA102,DATA_PIN, CLOCK_PIN, RGB>(LEDS,NUM_LEDS;
  Serial.begin(SPEED); // Teensy/32u4 disregards baud rate; is OK!

  Serial.print("Ada\n"); // Send ACK string to host
}
  
  // Dirty trick: the circular buffer for serial data is 256 bytes,
  // and the "in" and "out" indices are unsigned 8-bit types -- this
  // much simplifies the cases where in/out need to "wrap around" the
  // beginning/end of the buffer.  Otherwise there'd be a ton of bit-
  // masking and/or conditional code every time one of these indices
  // needs to change, slowing things down tremendously.
  uint8_t
    buffer[256],
    indexIn       = 0,
    indexOut      = 0,
    mode          = MODE_HEADER,
    hi, lo, chk, i, spiFlag;
  int16_t
    bytesBuffered = 0,
    hold          = 0,
    c;
  int32_t
    bytesRemaining;
  unsigned long
    startTime,
    lastByteTime,
    lastAckTime,
    t;
  int32_t outPos = 0;

  startTime    = micros();
  lastByteTime = lastAckTime = millis();