It's not entirely clear what you're asking -- but it would help to know which version of the program you're using and on what operating system.
It would also help to know the measurements of your photos, measured in pixels. You should not use a photo much larger than 2000 pixels wide and 1500 pixels tall (at 72 ppi). Photos directly from a camera can be much larger than that and may be rejected by the program.
It would also help to know where these photos are from and if they are on your hard drive.