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Hi, basically, what you enter in that field needs to be in the correct format for Wordpress to understand it, just as you would use if you were creating a custom WP_Query code. What happens is the field turns into a variable and is output in our WP_Query code that runs the widget.
All this means in real life is that you need to use the category ID numbers, separated by commas if there is more than one - 21,32,15, ECT. If you want to exclude a category, you use a minus sign before the id number, like -15,-23 and so on.
Here is a link that describes how this works in WP - basically what follows cat= is the variable you're creating in the widget category field:
codex.wordpress.org/Class_Reference/WP_Q...#Category_Parameters
Also a link to help you find category id numbers:
www.wprecipes.com/how-to-find-wordpress-category-id
Hope that helps.
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