The first step is the most simple one. Connect your HERO Board with the computer and the circuit is built.
The simulator always needs a board to communicate with.
Thanks to the simulation software, the building of circuits has been omitted and this makes it much easier to test your code. The simulator can also simulate missing parts while parts are still built up. Suppose you miss a button, connect your other components and simulate the button on the screen.
Make sure to install the Arduino IDE where you will write the codes in.