Hide Pages Plug-In Not Compatible w/ Theme

I am using the Noteworthy theme and would like to create a page that is only visible by clicking a link somewhere else on my site. With my theme, whenever I create a new page, it is automatically added to my Menu at the top of the site.

I installed the Hide Pages plug-in only to find out that it does not work with custom menus on certain themes. -So I uninstalled it.

I’ve read a lot of support pages that lead me to think there should be an “exclude” feature somewhere, but I can’t find it within my theme. I don’t know what I’m doing so I do not want to mess with code. Is there a way to do this within wordpress already, or the Noteworthy theme, or a different plug-in that WILL work with my custom menu?

Thanks for any advice.