The License setting of your space shows you exactly which version of PBworks you are using.  When you purchase an upgrade for your space through our website, there is no need for you to put in a license key for your space, and the Classroom Edition upgrade is immediately put into effect.  

Click the "find out more about upgrading" link in this setting to find out when your Classroom Edition upgrade expires. 

If your upgrade is provided by your school, then you may see that the License is "Campus Edition" and the people responsible for the Campus Edition at your school listed.

The license key and SKU of your Campus Edition license are displayed in the Campus Dashboard.