frenzy/lib/frenzy_web/templates/group/new.html.eex

<%= form_for @changeset, Routes.group_path(@conn, :create), fn form -> %>
  <div class="form-group">
    <label for="title">Title</label>
    <%= text_input form, :title %>
  </div>
  <div class="form-group">
    <%= submit "Create Group" %>
  </div>
<% end %>