How Do I? (NavBar Related)

[2fast4ya]

Ok, so wondering through my forums today, as a guest, I noticed I didn't see the Register Button. My Navbar is pretty much custom, so I'm sure I accidently messed it up somehow. So this is what I want to do. I know a little bit of coding, but nothing great. I want unregistered/not logged in users to see a link for Registration. Like this.

I know that you need like { } kinda stuff to turn that text to the right link, and I can get the link, but what exactly is the {} to type into make it a link?
Also as you can see where I want only guests to see a register button there. Can someone please help me? $10 to first person that can accuratly get this to work for me. Thanks