How do I set mesh characteristics?

When I add a mesh…such as a circle, a sphere, or addons such as a bolt etc, I never get a menu/list of parms where I can define the mesh, such as size of the circle etc. The mesh shows up set as whatever the blender default is. How do I see and change this?

Assuming you use 2.6+. At the bottom of the Tool Shelf (T). If it’s not there, press on the + icon.

or press F6 after creating the object.

I am not sure that this is what you are asking about. Yet when you add an object and before you do anything else, scroll down in the tool-box. All kinds of fun things to play with!

Thank you…that did it. I love this forum.