Make sure you have done successfully the Wiring hardware and software Setup process with special attention to steps 3 and 4, these steps have to be repeated after changing the USB port used with the Wiring hardware or changing a board. The diagrams below show the reset on a Wiring board but the RESET switch is also present in the WiringMini board.

Verify your program is free of compiling errors by pressing the Compile/Verify button in the menu bar.

Press the reset button in the Wiring hardware and immediately press the Upload button in the menu bar. If something goes wrong the Wiring environment will print an error message. If things are fine it will tell you the Upload was successful.

After a successful upload press the RESET button on the I/O board to restart the program you just uploaded into it. It takes from 5 to 7 seconds for your program to start after resetting the board.