Hi,
You should be able to follow the instructions here. Unfortunately, I am unable to post outside links since I don't have 10 posts yet. Ironically, I came here to try to hit my 10 posts so I can eventually post in the dev forum.
Be sure to replace DOT with a .
nexusshacksDOTcom/nexus-s-root/how-to-root-nexus-s-or-nexus-s-4g-on-ics-or-gingerbread/