The links that appear in the right-side maroon site navigation are called Navigation Titles. To change a link you see in the right-side maroon site navigation, you want to edit the page referenced in the right-side nav. For instance, in the image below, if I wanted to change the link on the right that says Photography, I don't want to edit the Website Guide page--I want to edit the Photography page itself and modify it's Navigation Title.
The Navigation Title is found on the Properties tab. Navigation titles should be relatively short, but still need to make sense to the user trying to find the information in that page or section. If the word "and" is required, Web style indicates an ampersand (&) should be used in the Navigation Title field.