2
If you're asking what module to use to display RSS on your site, here's a good one:
https://xoops.org/modules/repository/singlefile.php?cid=84&lid=1437
If you're asking how to make the feed show up in a center block, check here:
https://xoops.org/modules/smartfaq/faq.php?faqid=76
(forget about using the "Tutorial" and "Blocks advanced" links on the page. The links are both broken.)