Jeremy,To change the size you use the Resize Tool (that's the tool with the % icon). You can use the Resize Tool in three ways. Note that the Resize Tool does not change the page size. I will come back to the page size in a moment. Read on:
1. Clicking the upper left corner in Page View allows you to scale everything on the page.
2. Clicking to the left of a staff in Page View allows you to scale that staff only.
3. Clicking a note allows you to scale that note only.
With the Page Layout Tool you can change the page size.
Now Finale knows the new page size. But the printer driver should know it as well. Therefore, the last step before you can print is selecting Page Setup... in the File menu and setting the page size there.
Peter