Congratulations!
Now you need to install the web part. Follow the instructions to install Bitlash Commander here: GitHub - billroy/bitlash-commander: Web-based dashboard builder for Arduino.
Commander runs a web server on your PC. The instructions tell you how to set it up and feed it.
Please note you do need development tools installed on your system (a compiler) for the Commander install to succeed. On Windows, you need Visual Studio 2010. On OS X, you need the free XCode install, and on Linux you need gcc / build-essential.
-br