Please do this:
- Make sure the Arduino Create plugin is running on your computer.
- Plug your MKR1000 into your computer with the USB cable.
- Open the Arduino Web Editor: Arduino Cloud
- Click the "Examples" tab on the left side of the screen.
- Click on "01.Basics (6)".
- Click on "Blink". This will open the Blink example sketch in the sketch pane.
- Make sure "Arduino/Genuino MKR1000" is selected from the dropdown menu at the top of the sketch pane and that its port is recognized.
- Click the right pointing arrow button (Upload) at the top of the sketch pane.
The Blink sketch should now be uploaded to your MKR1000. When the process finishes, you should see the text "Success: Done uploading Blink" on the green bar at the bottom of the sketch pane. Did the upload work for you?