T-Relay - How can I use on-board LED?

[jpvonoy]

I want to have the on-board LED (LED5) turn on whenever the T-Relay module is powered. I tried adding the following to my code in the setup function, but the LED only briefly flashes then goes off when power is applied.

pinMode(25, OUTPUT);
digitalWrite(25, HIGH);

What should I do to turn the LED ON?

[Sukaibin]

@jpvonoy
pinMode(25, OUTPUT);
digitalWrite(25, LOW);