app/views/devise/passwords/edit.html.erb
<% content_for :header do %>
<p>
<h1>Change your password</h1>
</p>
<% end %>
<%= simple_form_for(resource,
as: resource_name,
url: password_path(resource_name),
html: { method: :put }
) do |f| %>
<%= f.error_notification %>
<%= f.input :reset_password_token, as: :hidden %>
<div class="form-group">
<%= f.input :password,
label: false,
placeholder: "New password",
required: true,
autofocus: true %>
</div>
<%= f.button :submit, "Change password" %>
<% end %>