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Praveen Verma 10Praveen Verma 10 

SFDC: How to enable Site.com Publisher User Licenses

I want to create a website in sales force using site.com. I am using free trial version of Salesforce developer edition.
Below is the page I am getting if I select Site.com 
User-added image
And the Administrator User's current setting are as following- 
User-added image
So, to use the Site.com, I am trying to enable the "Site.com Publisher User". To do so, I checked the Site.com Publisher User checkbox and tried to save it. But I am getting below error-

No Site.com Publisher User Licenses Available
There are no Site.com Publisher User Licenses available. If you wish to add Site.com Publisher User Licenses, please submit a case. A salesforce.com representative will contact you.
Rahul KumarRahul Kumar (Salesforce Developers) 
Hi Praveen,
May I suggest you please refer the below link for reference. Hope it will be helpful.

Please mark it as best answer if the information is informative.so that question is removed from an unanswered question and appear as a proper solution.
John Johansen 2John Johansen 2
The first link doesn't work. The second doesn't get me closer to solving the problem.