When you have the image you want, click the Printer
You will now be shown the Printer Layout
. Click on the size you want from the defaults shown. These can be changed through Tools -> Options -> Printing.
Say you want A4 size, click the Full Page
tab. Then go to the Printer Setup
tab where you must change the size of the paper as well as media type, through the print properties/preferences to suit the size you want including orientation.
If the output size you require is smaller than the default size paper set in your printer, it's not such an issue.
Click the Review
tab next to the Print tab and it will warn of quality deterioration if you have chosen a small image to be printed at a much larger size. My example shows this 'problem'.
Now click the Print tab and depending what printer and set up you have, you maybe shown a preview for approval before you finally print. Trial an error sometimes is the only true way of see what the end product will look like.
Hope this helps.