Hi Becky,
Go to:
File>>New>>Under the Resize tab that is where you chose Portrait or Landscape then Paper Size then Select Resolution from there you can chose 300.
If you have alreadt created the page try Format>>Resize Image and chose 300dpi under the Select Resolution tab.
This should be the same for DIP 9 as well. Hopefully that will get you a 300dpi. I have never had a problem saving JPEG's in 300 dpi in DIP7 or 9. I did have problems with saving PNG's at 300 dpi with DIP 7. DIP 7 is very quirky about that. DIP 9 is much better for creating elements.
If all else fails you may have to copy your entire LO (ctrl+a to select all>>ctrl+c to copy>> ctrl+v to paste) and paste it to a fresh 300 dpi canvas. Very easy to do.
Shelleyrae is VERY good at this. She may be able to jump in if these suggestions don't work.
