Doesn't work yet, but are close

app/views/forums/edit.html.erb

@@ -25,6 +25,10 @@
       <td><%= f.label :necro_length, "Necropost warning delay (in days)" %></td>
       <td><%= f.number_field :necro_length, placeholder: "Warning Delay (leave blank for no warning)" %></td>
     </tr>
+    <tr>
+      <td><%= f.label :disable_deletion, "Disable deletion of threads for non-staff" %></td>
+      <td><%= f.check_box :disable_deletion %></td>
+    </tr>
   </table>
   <p><%= f.submit "Update Forum", class: "btn blue left" %></p>
 <% end %>