How to rotate a text box in MS Word 2003

I’m trying to do some really cheap graphic design work by overlaying text ontop of a graphic. I can add a text box, type, set font and color, but can’t rotate it to the odd angle I need. When I right-click on it and select format text box, under the size tab there is a drop-down for rotation, but its grayed out. Any idea what I’m doing wrong?

Thanks for any help.

From Microsoft Answers: