Yes, you can crop your photo prints before they are sent to print. Here's how:
Tap the photo you’d like to crop
Tap “Crop” from the bottom icons
Adjust the crop and tap “Save”
You can also adjust individual borders for each print
Tap the photo you’d like to edit
Tap “Border”
Choose between “Full” and “Border” (you can also apply your choice to all prints)
Tap “Close”