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 https://www.arduino.cc/download_handler.php?f=/arduino-1.6.11-windows.exe 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.