The drag-and-drop code editor that you will use doesn’t work with the Arduino web editor.  In order to get started, you’ll need to install a standalone version of the integrated development environment.

Follow these steps, or watch the tutorial below to install the proper version of that software.

1. Go to to download the file.

2. On the page that opens, click “Just download” or make a contribution if you wish.

3. Open the downloaded file and follow the instructions on the screen to finish the installation.