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From your admin section Blocks-->List All Blocks
Once the new page opens, you'll see a drop-down menu box with all of the blocks from your installed modules.
Choose "Recent News" from the list. Click the "Add" button. You'll be redirected to a new page with different options for the block's placement, position (weight), whether or not it's visible, what pages to display it on, and a few other option.
It's important to pick the topics that you want displayed in the block, or nothing will appear.