from the quoted link:
Title the second page "Blog" (or you could call it "News", "Articles", etc.). This page will be a place-holder for showing the Posts on your site.
Do not use a custom Page template for this page! home.php or index.php will be used to generate this page.
DO NOT add content to the Blog Page. Leave it blank. Any content here will be ignored -- only the Title is used.
Publish the Page.
Go to Administration > Settings > Reading panel.
Reading panelSet 'Front page displays:' to 'a static page' and choose the first page you created above for 'Front page.' If your WordPress site will contain a blog section, set 'Posts page' to the page you created for this above. Otherwise, leave this blank.
i.e. the 'blog' page should not be seen using the 'showcase' template.