Datasheet

OK you are done! (Not so bad, eh?)
Blink!
OK let's practice uploading a sketch by uploading the classic Blink sketch with the USB
bootloader. This program with blink the onboard red LED that is connected to pin #13.
The sketch is in File->Examples->Basics->Blink
Select the Pro Trinket 5V/16MHz (USB) or Pro Trinket 3V/12MHz (USB) board
from the Tools->Board menu
If you are using Linux you may have to be "root" running the Arduino program to have
access to the USB port
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