The link you gave us is a single post page, more tag do not work there.
More tags work in a page with posts where you display many posts.
To create a page with posts, select the page with posts template and publish, that will open all the page with posts option to select which posts to display and how.
Make sure the WP default post page is not active by going to Settings > Readings, set front page to “A static page”, and make sure nothing is selected in the posts page drop down list (showing -select-)