There are multiple ways to rerpint a photo
Reprint Keyboard Shortcut
You can enable a keyboard shortcut to reprint the photo from the last session. Go to Settings (ctrl-1) > Keyboard > enable the keyboard shortcut
You can use the photo album feature to select the photo and send it to the printer. To enable the photo album, go to Start Screen Settings by pressing ctrl-2 from the main screen and enable the Album button. This will display an album button in the upper right of the video area, so you can access the photo album in between sessions.
To enable prints from the photo album, go to Settings (ctrl-1) > Photo Album > Image Options > enable Print