app/views/users/show.html.erb
<aside class="update">
<%= form_for @user, :html => { :class => 'update vertical' } do |form| %>
<%= form.text_field :email, :type => 'email', :disabled => 'disabled' %>
<%= form.password_field :password, :placeholder => 'new password' %>
<%= form.submit "Update account" %>
<% end %>
</aside>