Change permalink

Hi,

I’m finishing the last details of my website layout (or at least that’s what I hope), and I have a small detail I can not fix.

My page “Over mij” has as permalink http://www.nomadamoderna.com/over-mij-2/. I would like to have it as http://www.nomadamoderna.com/over-mij/ but it doesn’t let me make this change. And I also don’t see any other page with this name… Just don’t understand why.

Any suggestion?

Best regards,

Nomada