Arduino Mega enable pin connected to timers

Okay, so I have the timer0, it works fine, I can monitor it on th serial port.
According to the datasheet pin 4 is attached to timer0 What does this mean?

I thougth the tiemr's sign appears on pin 4 like a square sign or a pwm. But I can't see anything on It.

That makes me wonder if i have to enable the timers output on the pin 4 in order to see it