Can't use module functions - why?

<%- if @topic_view.topic.tags.present? %>
<%= t 'js.tagging.tags' %>: <%- @topic_view.topic.tags.each do |t| %> <%= t %> <%- end %>
<% end %>

**Silverstripe Version:4.7


I’ve installed ‘blog’ module using composer, executed …dev/build?flush=1 in the browser and still no blog page option under new page creation form.
What am I missed?

Best regards.

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