Lightroom - reorder pictures in the print mode

[Lemaildetom]

Hello,
I've been using lightroom to create a composite of images in the print module for Christmas. It's as i want it but I would like to reorder the picture swapping the 2nd and 3rd. Any idea how can i do that? I can't seem to be able to change drag, drop... or anything.

Thanks for your help.

 

[Lemaildetom]

I'm a neep, just manage to drag and drop to reorder in the library module then back to the print module!