Where is Modifiers.

I use Blender2.42a.
Where to find SubSurf? Someone told it is in Modifiers?
What is it? Where to find it?
Please help.
Please give step by step instructions.
thanx

http://mediawiki.blender.org/index.php/Manual
http://mediawiki.blender.org/index.php/Manual/Modifier_Stack#Modifier
http://mediawiki.blender.org/index.php/Manual/Subsurf

“Modifiers are added from the Modifiers tab in the edit buttons (F9). The Modifiers tab appears when a Mesh, Curve, Surface, Text, or Lattice Object is added or selected.”

Mike

thanx Mike_S for your help.