I don’t often used curved text, but when I do, and when I also have to reverse the text, I usually get stuck and have to go googling around for a tutorial on how to do it. Here is one such tutorial on reversing the path of curved text in Paint Shop Pro:
Create a shape, in my case, it’s an ellipse. The gist of this is that some shapes such as those drawn with the Pen tool, are already paths. Others, like the ellipse, are not. Therefore, you need to Convert it to a Path, and then you can reverse the path.
With the Pen tool active, right-click on the path and you will see the option to Convert to Path. Now you will be able to click on Reverse Path under Edit.