app/views/users/_signup_form.html.erb
<%= remote_form_for user do |f| %>
<%= f.input :name %>
<%= f.input :email %>
<%= f.input :password %>
<%= f.input :password_confirmation %>
<%= f.input :license_aggrement, :as => :boolean,
:label => t('simple_form.labels.user.new.license_aggrement').html_safe %>
<div class="action-links">
<%= link_to_modal t('users.form.has_account'), '#sign-in' %>
</div>
<p>
<%= f.button :submit, t('submit') %>
</p>
<% end %>