How do I make my image fit inside the crop?

If the image does not fit within the bounds of the print space (crop marks), that means the photo is not proportional to the print size you have chosen. 

Your best bet is to select a print size that is more closely proportional to the image. For example, if your image’s proportions match an 8x12 size (2:3 aspect ratio), but you have selected an 8x10 size (4:5 aspect ratio), then the image will be cropped.