Where will I find the Bisect tool?

I am very new to blender. I was watching some videos on how to use the bisect tool, but when I try and find the tool, I can’t find it. I’ve looked in a lot of different locations for it, but it doesn’t seem to be there. I have also searched for it by pressing the space bar. Does anyone know where it might be? I am using blender 2.69 if that helps.

Spacebar and search for bisect. You need to be in Edit mode

It’s in the mesh menu. Obviously the mesh menu is only available in edit mode. It should also be in your toolbar - once again only in edit mode.