Photoshop 8: How do you change the size of the border on a rectangle drawn by the Rectangle Tool

Can you change this AFTER you have created the rectangle or square?

Or can you only change the border size before drawing it?

In either case, I read something that says select the tool, then select Edit->Stroke to set the stroke pixel size... but when I do this Stroke is grayed out...  If I draw the rectangle and then try to select the stroke it is still greyed out.

I know this is something simple but I just can't figure it out.  Urgent not difficult. 500 pts bounty.
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Here is what I usually do:

1) Draw the rectangle
2) In the Layers window, double-click the layer with your rectangle in it (over on the right, next to the layer name)
3) This brings up the Layer Style Box. On the bottom left, click Stroke (and check the box)
4) Mess with the options in the pane on the right (you can select the color, etc) until the stroke looks the way you want

Hope that helps,
Another option is this (actually, you can use this on any shape, and the same is true for the method above)

1) Create the shape
2) Go to Layer-->Rasterize-->Layer
3) Select the shape with the magic wand tool
4) Go to Edit-->Stroke
5) Select the options you want and hit OK


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