app/views/users/forgot_subdomain/new.html.erb
<%= content_for(:page_title, "Forgot Subdomain?") %>
<h2>Forgot Subdomain?</h2>
<p>
Enter your email address below and we'll help to find your subdomain.
</p>
<%= simple_form_for(@resource, url: forgot_subdomain_path, html: { method: :post }) do |f| %>
<div class="form-inputs">
<%= f.input :email,
required: true,
autofocus: true,
input_html: { autocomplete: "email" } %>
</div>
<div class="form-actions">
<%= f.button :submit, "Send me login instructions" %>
</div>
<% end %>