Page has been deleted but the link is still showing in the navigation bar

I'm working on this website for my friend. She just signed up today and I'm not terribly familiar with 7.1. I deleted most of the demo pages but the donate button in the corner won't go away. Anyone have any ideas what that could be about?

If donate was a page/section in an index page, it is usually good to drag it to the unlinked section before deleting it. You may have to restore it, drag it the unlinked section which should take the link off the nav bar and then delete it.