I created a collage earlier today and whilst I could print it and save it as a job, I was unable to save it as a file to my desktop. I know that this is possible. Would anybody care to enlighten as to how to do it.

Saving files confused me no end until these guys explained it a few times. If you right click and choose the convert option, you get a simple conversion. You can change the color space and location. OTOH, if you choose edit, you can then do a save as, under file. That takes you through two windows, one to choose the file name and location, the other to change the color space and resample, if you like. I almost always use the save as option now because I usually want to resample for some given purpose.