To find out your Salesforce Edition, just look at the title of your web browser when your open Salesforce.
It should say something like:
salesforce.com – Enterprise Edition
or
salesforce.com – Developer Edition
Alternatively, you can do this to find out your Edition:
1.Go to Setup
2. Type in “company”
3. Chose company information
4. “Organization Edition” is the name of your Salesforce Edition.