Well as a user of PSP9, let's see if I can help
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When you open the file, you can go to "Image -> Canvas Size" and change the dimensions there, so you have more space to work in.
Also, there is a small minimise maximise close bar underneath the one to close PSP9. If you click on the minimise there, you'll find any other files you've opened. Keep minimising them til they're all minimised, then you should be able to access them all freely. If you're wanting to copy and paste something in, click "copy" on wherever you see it (you could also do this in another PSP9 file, click copy, minimise and then maximise the window you are pasting it into) and then go to Edit -> Paste -> Paste as Transparent Selection. Hope that helps!