How can I add new page type on silverstripe?

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

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How can I add a new page type?

Hi, i’ve tried creating a new page type following this tutorial: https://www.silverstripe.org/learn/lessons/v4/working-with-multiple-templates-1
But when i dev/build I can’t see anything new.
I would like to create new pages like the log-in page, news…but I’m stucked here. Thanks

// Include any relevant code. If you have a lot of code, link to a gist instead.

Never mind.
I forgot to open tag <?php and close it ?>

Thanks anyway. Solved, can be closed.