Change wiki permalink

Mu website: http://174.120.16.66/~thomasse/

I have created the main wiki landing page, and that seems to be working, I think. It is here: http://174.120.16.66/~thomasse/knowledgebase/knowledgebase/

I am a little confused on the permalink, however. I want it to just be /knowledgebase ..... not .knowledgenase/knowledgebase. How can I change this? I already have the slug for that wiki set to knowledgebase