app/views/devise/registrations/edit.html.erb
<div class="panel panel-primary">
<div class="panel-heading">
<h3 class="panel-title">Edit <%= resource_name.to_s.humanize %></h3>
</div>
<div class="panel-body">
<%= form_for(resource, as: resource_name, url: registration_path(resource_name), html: { method: :put, class: 'form-horizontal' }) do |f| %>
<%= devise_error_messages! %>
<div class="form-group">
<%= f.label :email, class: 'col-sm-3 control-label' %>
<div class="col-sm-5">
<%= f.email_field :email, class: 'form-control' %>
</div>
</div>
<div class="form-group">
<%= f.label :password, class: 'col-sm-3 control-label' %> <i>(leave blank if you don't want to change it)</i>
<div class="col-sm-5">
<%= f.password_field :password, autocomplete: "off", class: 'form-control' %>
</div>
</div>
<div class="form-group">
<%= f.label :password_confirmation, class: 'col-sm-3 control-label' %>
<div class="col-sm-5">
<%= f.password_field :password_confirmation, autocomplete: "off", class: 'form-control' %>
</div>
</div>
<div class="form-group">
<%= f.label :current_password, class: 'col-sm-3 control-label' %> <i>(Enter your current password to confirm changes)</i>
<div class="col-sm-5">
<%= f.password_field :current_password, autocomplete: "off", class: 'form-control' %>
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-3 col-sm-5">
<div class="btn-group">
<%= f.submit "Update", :class=>'btn btn-primary' %>
<%= link_to "Cancel my account", registration_path(resource_name), :class=>'btn btn-danger', :data => { :confirm => "Are you sure?" }, :method => :delete %>
<%= link_to "Cancel", :root, :class=>'btn btn-warning' %>
</div>
</div>
</div>
<% end %>
</div>