Edit details:

<%= error_messages_for 'user' %> <%= start_form_tag :controller => 'user', :action => 'edit', :display_name => @user.display_name %>

display name	<%= text_field :user, :display_name, :value => @user.display_name %>
description	<%= text_area :user, :description, :value => @user.description %>

<%= submit_tag 'Change' %> <%= end_form_tag %>