Please take a look at no right click html for the html code needed to disable right click. Copy the code on that website and paste it into the head tag of the page you don't want people saving your images from. To find the head tag, click on page settings in the top toolbar and select the advanced settings tab. Here you will see a section to paste in the code.
This isn't fool proof and some of the more savvy people can still get your images (through your source code) so the full proof method would be adding a watermark to all your images.