Vivian, you could create a new level, call it anything your like and then use properties to link in to the real page or even some other website.

If you don't want the real page to be visible on the menu, there is an option to hide it up the top (step 3 map, select page, select hidden.

You could also simply place some text or an image in the header or where ever, and link it to the page you want - this could look as much like a menu option as you wish.