Getting Started with Platformer Starter Kit (PSK)

I am using the TGB demo version 1.74 and just purchased the Platformer Starter Kit (non-Pro edition) this evening.

I load up the PlatformerDemo project to see how it all looks inside TGB, then I press the 'Play' button to check out how the game works before I get in there and mess everything up - turns out that the main character just floats above the terrain and does not respond to keyboard commands...

I take a closer look at the ReadMe and it says that I need to 'recompile the engine' and 'make changes to my xcode project' before I can even get started. This is where I'm getting to the point of this post; I have no idea what any of this means.

I have been running through tutorials and editing CS files in wordpad, I was kind of expecting to just open up the project file and have it work without needing to do any modification beyond installation. This is quite confusing, does anyone who has recently gone through this process have a moment to help a noob through as well? Thanks, KTB