Be sure to have a copy of the Bootstrap stylesheet available on your
application, you can get it on http://twitter.github.com/bootstrap.

Inside your views, use the 'ext_form_for' with one of the Bootstrap horizontal form
classes, as the following:

  = ext_form_for(@user) do |form|

Other form class, just use the 'simple_form_for':

  = simple_form_for(@user, html: {class: 'form-inline'}) do |form|