Adding more photos to print couldn’t be easier—just go to the filmstrip and Command-click (PC: Ctrl-click) any photo you want to add to the print queue. Lightroom instantly creates another page in the queue for the selected photo. In Figure 5, notice that the info area now says "Page 1 of 6."
To remove a photo from the print queue is just as easy: Go to the filmstrip and Command-click (PC: Ctrl-click) any selected photo to deselect it. Lightroom removes the page from the queue automatically so you don’t print a blank sheet. That’s the scoop: Selected photos print on their own separate pages, and unselected photos are just ignored.