What Key do you press to "Jump" in the T_T Tutorial?

I own a Mac, and I was wondering what keyboard key do you press to "Jump"?

I'm not familiar with the tutorial you refer to, but if you're working in the editor, check the input manager settings (Edit->Project Settings->Input), find the entry named 'Jump', and see what controls are assigned.

You can change the default controls in the input manager settings; you can also change the controls for the standalone in the input/graphics window that (optionally) opens when you launch the application.

You press the space bar