How to subdivide a plane?

I don’t know how to select vertices, and when I press “W” button there isn’t “subdivide” in pop-down menu. I use Blender 2.49b.

Subdividing only works with selections that have 2 or more vertices in them. Subdivide really works with edges, so you might as well just go into edge or face selection mode.

I found this tutorial really helpful when I was first learning blender:
http://en.wikibooks.org/wiki/Blender_3D:_Noob_to_Pro/Modeling_a_Gingerbread_Man

Press TAB to enter edit mode and THEN press W

Thank you all.