How to access MS Sharepoint to set up for first time

We recently migrated our email from GoDaddy to Comcast/Office365 premiere.

I'm looking for instructions to set up Sharepoint in our account. I'm trying to follow the instructions here:

http://businesshelp.comcast.com/help-and-support/internet/creating-managing-a-SharePoint-site/

We do not have an option in our Manage Services > Internet page for Sharepoint. The only thing appearing in there is Norton Antivirus.

How do we get the Sharepoint option added to our account? We're paying for it, we'd like to use it.