HI! So, I want to program an ATtiny85 through my Arduino Uno. I brought up the ArduinoISP from the example menu and changed the 20ms delay to 40 in the heartbeat() function like they said. Then I clicked verify and it lit up the "Serial.begin(19200); in void setup() and it said "'Serial was not declared in this scope'". Does anyone know why? Thanks 
Which board did you select ?
A little guide to programming the Attiny 85:
One problem is that the Attiny85 arduino does not have a serial port. This means it is difficult to debug any program you run on it.
One way to solve this is to use the software serial.