GMod Robotics Simulator

[Geek_Girl]

Hey, newbie questions, as I have never done anything with the source engine or garry's mod:

1. Do I put it in the first or second garry's mod folder? As in, is it in
C:\Program Files\Steam\steamapps\*steam name*\garrysmod\ or
C:\Program Files\Steam\steamapps\*steam name*\garrysmod\garrysmod ?

2. How do I actually run it? Do I start garry's mod and then somehow select it from there, or what?

Thanks!