You will need a Chrome or Firefox based browser to use this tool. You may need to click "allow" on multiple popups in firefox.
1: plug your board into your computer using USB
2: select which project you wish to load from the dropdown
3: click Install Code
4: select the board from the popup window
5: select install
Troubleshooting ideas:
1. hold "boot" on your board from before you plug it in until after you have clicked the install button
2. be sure you are selecting the serial option from the dropdown, not bluetooth
3. Ensure you have selected the correct project from the dropdown list.