WordPress.org

How to define an order?

Just type in the page and category-ids in a comma separated list in the "Order" widget option. The items will be displayed in the exact order you typed in from top to bottom. Remember to add a trailing "p" to every single page id. If your page id is 42 you'll have to write down 42p.

If you're not sure about page and category ids search for a plugin or hover the links in the listing views and look into the statusbar of your browser. The id should be part of the url.

What am I supposed to write down in "Page Args" or "Category Args"?

You can define excludes and stuff like that by providing args to Page-Cat-List that you would normally hand over to get_pages or get_categories. Just take the syntax from there.

Do you have some kind of example configuration?

Well...click on the screenshots section. The important stuff is handled there.