Can I get the nav links again?

I've removed the nav links and I want to get them back,how can I?

You would have to click the Add a Customized Menu in the nav links, by going to your Admin Panel >> General >> Home Page >> Nav Links. And add them all back.

Or you could restore your board back to the time before you removed them all, but you would lose any work you have added after that point.

Sorry,this is not what I mean!
I meant the nav links on the portal.

You mean the navigation on your portal? Try admin panel=>Modules=>Portal pages management and click the "Structure " button. Now form the "Addition/deletion of personal modules" section choose Navigation from the Modules menu. Then click the "Add the module" button.

Yes this is what I meant and no it didn't work because the words are there but when I try to click on it,nothing happens!