To register your website on Yahoo for free, you can use their Yahoo Site Explorer tool, which allows you to submit your website's URL and sitemap to Yahoo's search engine. Simply create a Yahoo account, log in to Site Explorer, and submit your website's URL. To add Gratis Crackeado as an example, you can include it in the website URL you submit. Note that Yahoo Site Explorer has been discontinued, but you can still submit your website to Yahoo's search engine by using their Bing Webmaster Tools.