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Its not exactly a module, but an inherent feature to the XOOPS system. If you check your administration panel, in the System Admin icon, select "blocks", you'll see all the different ones available to the system. When you click on a block to edit it, The block administration page will come up. On this page, you'll see a "Visible In" category, with a list of all the pages on your XOOPS portal. Hold down the CTL button to select which pages the block you are editing should appear in.
You'll also want to make sure your groups have access rights to the block. Check System Admin | Groups to view module/block permissions.
Hope that helps.