entrydns/app/views/devise/registrations/edit.html.erb

<div class="page-header">
  <h1>Edit <%= resource_name.to_s.humanize %></h1>
</div>

<%= form_for(resource, :as => resource_name, :url => registration_path(resource_name), 
  :html => { :method => :put }) do |f| %>
  <%= devise_error_messages! %>

  <div><%= f.label :first_name %>
    <%= f.text_field :first_name %></div>

  <div><%= f.label :last_name %>
    <%= f.text_field :last_name %></div>

  <div><%= f.label :email %>
    <%= f.email_field :email %></div>

  <div><%= f.label :password %> <i>(leave blank if you don't want to change it)</i><br />
    <%= f.password_field :password %></div>

  <div><%= f.label :password_confirmation %>
    <%= f.password_field :password_confirmation %></div>

  <div><%= f.label :current_password %> <i>(we need your current password to confirm your changes)</i><br />
    <%= f.password_field :current_password %></div>

  <div><%= f.submit "Update", class: 'btn-primary' %>
      <%= link_to "Back", :back %></div>
<% end %>

<hr />

<div class="alert alert-error">
  <h3>Danger zone</h3>
  <%= link_to "Cancel account", registration_path(resource_name),
    class: 'btn btn-danger pull-right',
    confirm: "All your data will be deleted! Are you sure?", 
    method: :delete %>
  <p>If you cancel your account all your data will be deleted!</p>
</div>