This can be done through the Merchandising tool in the Personalization Portal. Please click here for the tutorial.
How can I set a product to always show in the recommendations on site?
- Updated
<% if (previousArticle) { %>
<% } %>
<% if (allItems.length > 1) { %>
<% if (previousTitle) { %>
<% } %>
<% if (nextArticle) { %>
<%= previousTitle %>
<% } %> <%= previousArticle.title %>
<% if (nextTitle) { %>
<% } %>
<%= heading %>