app/views/user_profiles/_user_info.html.erb
<%= fields_for @user do |f| %>
<%= f.error_messages %>
<% if @user.auth_type == "built-in"%>
<p>
<%= f.label :password %><br />
<%= f.password_field :password %> </p>
<p>
<%= f.label :password_confirmation %> <br />
<%= f.password_field :password_confirmation %></p>
<% end %>
<% end %>