The tutorial mentions that pressing S will allow me to change Gus's (gingerbread man

What am I doing wrong here?
Also, this is my first time using any 3D program, so I know no technical knowledge, and am just starting out.
Also, how can I use the MMB? What keyboard shortcut simulates the MMB?
Thanks
(I'm using Windows)
Blender seems great so far, guys! Great work!!