app/views/registrations/admin_edit.html.erb
<h1>Editing registration of <%= @registration.user %></h1>
<%= form_for(@registration) do |f| %>
<% if @registration.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(@registration.errors.count, "error") %> prohibited this registration from being saved:</h2>
<ul>
<% @registration.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
Topic<br/>
<%= f.text_field :topic %>
</div>
<div class="field">
Repository<br/>
<%= f.text_field :repository %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>