To use lximage use the arrow to the right to view the next file in the folder and the arrow to the left to view the previous folder. To open a new picture press the open button which looks like a blue folder with a piece of paper in it. To save the file as something press the button that looks like a floppy disk.
If you wish to print a picture after viewing it from the file menu -> print or press control+ p to bring up a print dialog.