What is the price for Adobe Social and how to connect?



I create an Adobe ID and I try to connect Adobe Social but not working.... Appear this message:


Welcome to Adobe Marketing Cloud

To access the Adobe Marketing Cloud, link your Marketing Cloud solution accounts to your Adobe ID.
After this one-time linking you can seamlessly access all linked accounts using your Adobe ID.        "

I attached link "Get Access" and I try to connect with my account but not working where can I create an account for Adobe Social?  Thanks!