USB serial port missing

Hello, I need help :slight_smile:
I just got started with my arduino lilypad ans I realized I'm missing in tools> serial port the USB connection or serial port. Can anybody tell me why or what can I do to get stared, I can't wait.

Thanks

By what means have you connected the Lilypad to your Mac?

Getting Started Guide: http://arduino.cc/en/Guide/HomePage

Click on the link that applies to your operating system (which you didn't mention).