Acrobat XI Standard does not have any connection to FormsCentral. You don't need any subscriptions to use the form editing and creation tools in Acrobat XI Standard.
Any time I try to use the form creation function it takes me to the forms
central site and asks for my subscription information. Help!
Can you post your question in the Acrobat Forms Forums: http://forums.adobe.com/community/acrobat/forms
I don't know the workflow enough with Acrobat Standard since I work with FormsCentral, basically you are seeing an advertisement for FormsCentral, but there should be a way to get into Form editing in Acrobat Standard, someone in that forum can assist better with that.