Select/change pictures of article's gallery

I give up. No instruction on demo site about how to change pictures that displays when article is selected. On my browser 5 pictures are displayed when the article is selected. They display before the readmore text and come from the line "{photogallery}images/demo/project_demo{/photogallery}" that is displayed in the editor. But where is the module or any parameters to choose the pictures?
I'm also surprised that noone asked this before, it probably is something foolish that I cannot work out (headbang), :blink:
Thank you

Parameter is inside the code snippet:

So, just change the folder to:

Hope this helps.

Thank you, great service. U'r #1!