Which pins are the receiver and irled pins of the ATtiny IRlibrary (http://gammon.com.au/Arduino/IRremote_Attiny.zip)?
Have you looked at any of the examples?
Yes, I opened the IRsendDemo example, but it was the same as the other IRsendDemo in the library which is just IRlibrary, that's not for ATtiny. So, the ATtiny IRsend example said the IRLed connected to pin PWM 3 too.