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I started up with the blinking example an Arduino Uno. I uploaded the sketch with USBTinyISP. The LED blinks, great! Now, when I add Serial.write("Hello");, nothing appears on the console. How can I communicate with the Arduino with the USBTinyISP programmer?

The USBTinyISP is a programmer and doesn't provide a serial console.

Use instead the standard USB connection between the Arduino Uno and the Mac.

I'm trying to set a breakpoint at the first line in the loop of test.ino on Arduino Uno does not break.

The Arduino boards don't feature debugging.

Hardware debugging runs only on the LaunchPads from Texas Instruments.