add button

configureproductdomain.tpl

@@ -130,6 +130,9 @@
                                         </div>
                                     </div>
                                     <div class="col-sm-2">
+                                        <button type="submit" class="btn btn-primary btn-block" id="useOwnDomain">
+                                            {$LANG.orderForm.use}
+                                        </button>
                                     </div>
                                 </div>
                             </div>