Which pin of GPIOs are for LEDs ?

Hello

I want to use the GPIO to trigger a relay board. To skip the complexity of
compiling the kernel and dealing with the GPIO driver, I want to use the
GPIO for LED and use the available LED program. The manual mentions that
the LEDs are linked to GPB5 - GPB8. However, GPB5 - GPB8 are not written in
the description of the GPIO connector pins. 

Does anyone know which pin of the GPIO connector are for LEDs? 

I need only one channel to trigger the relay. Is there any other simple
solution?

Thank you.

Best regards,
Anat

hello aruangra,
which operation system do you use?