app/views/devise/registrations/edit.html.erb
<h2>Endre passord</h2>
<%= form_for(resource, :as => resource_name, :url => representative_registration_url, :html => { :method => :put }) do |f| %>
<%= devise_error_messages! %>
<div><%= f.label 'Nåværende passord' %>
<%= f.password_field :current_password %></div>
<div><%= f.label 'Nytt passord' %>
<%= f.password_field :password, :autocomplete => "off" %></div>
<div><%= f.label 'Gjenta nytt passord' %>
<%= f.password_field :password_confirmation %></div>
<div><%= f.submit "Endre" %></div>
<%= link_to 'Tilbake', representative_root_path %>
<% end %>