I cannot really be bothered following and digging through a phony URL right now, so I don't know what kind of site you have (isn't there some way to have that .tk nonsense closed down?). However, it sounds as if you are using a Bravehost Wizard. It is the only editor I know that adds things to your menu without your cooperation. Just use anything else for the "invisible" page.
Or sign on for a second site for your members. The chance of someone accidentally stumbling onto a site you do nothing to promote is minimal.
