Edit where pages link to

Hello,

I have setup a couple of pages. Now when you press the page, it links you to that page. But I would like to edit that part.
So instead of linking me to that page, I would like to link it to a different website or make sure it’s linked to nothing.

Example:

HOME
ABOUT
CONTACT
     MAP
     CONTACT FORM
If a user clicks CONTACT it should be linked to #, so the user goes nowhere. He will only be redirected to the right page if he clicks MAP or CONTACT FORM.

If a user clicks ABOUT he should be linked to www.google.com and not the ABOUT page.

Thanks for your time!