Chapter 2

I have a copy of build your own website the right way" 2nd edition.

I am currently going through chapter 2 and have come across a few issues.
Firstly , the divers pausing in a circle image does not seem to appear on the webapage.
Secondly i have tried to link the 3 web pages. The home page has all the links on which is , Home, about us and contact us. When I click on about us or contact us it takes me to the right page but the links are longer there.
Could someone please assist?