Problems with permalinks

HI there.

When I was building my website I have added few pages with lorem ipsum and named them lorem as well.

Now when I’m getting closer to finish the website and I have started adding the original content and change the page names but I still have the links names..

So for example a page was :
http://www.myweb.com/lorem and the article title was lorem

not the page is name contact us but link still stays
http://www.myweb.com/lorem instead of http://www.myweb.com/contact-us

I switched on and off permalinks but this simply does not help.

Is there anything else that I need to do?

many thanks for your help in advance

dompl