edit.html.erb

<%= bootstrap_devise_error_messages! %>
<div class="panel panel-default devise-bs">
  <div class="panel-heading">
    <h4><%= t('.sign_up', :default => "Sign up") %></h4>
  </div>
  <div class="panel-body">
    <%= form_for(resource, :as => resource_name, :url => registration_path(resource_name), html: { role: "form" }) do |f| %>
      <div class="form-group">
        <%= f.label :email %>
        <%= f.email_field :email, autofocus: true, class: "form-control" %>
      </div>
      <div class="form-group">
        <div class="col-md-6 no-padding">
          <%= f.label :first_name %>
          <%= f.email_field :first_name, class: "form-control" %>
        </div>
        <div class="col-md-6 no-padding left-padding">
          <%= f.label :last_name %>
          <%= f.text_field :last_name, class: "form-control" %>
        </div>
      </div>
      <div class="form-group">
        <%= f.label :password %><br />
        <%= f.password_field :password, class: "form-control" %>
      </div>
      <div class="form-group">
        <%= f.label :password_confirmation %>
        <%= f.password_field :password_confirmation, class: "form-control" %>
      </div>
      <%= f.submit t('.sign_up', :default => "Sign up"), class: "btn btn-primary" %>
    <% end %>
  </div>
</div>
<%= render "devise/shared/links" %>