This will involve Layers, and Vector objects. Using the Vector Shape tool create an ellipse that mimics the curve your want your text to have. With that done, select the Text tool, If you hover it over the ellipse you created the mouse pointer will change and have a small curve on it. Click to get the text box, and start writing your text. It should automatically curve  itself. When your're done click o.k.

Here's an example its for PSP9 but it should work just as well in other versions.

http://fifthhouse.net/pspcurvedtext.htm

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