There are three pieces that need to be in place to obtain a Signature Point Set: the REQ must be authored for eSignatures; the Expere Engine must be configured to support eSignatures; and the assembly must be done by the Expere Engine.
This feature is available with correctly authored documents and Expere Release 2014.1
Signature Point Sets can be obtained using the Requirements Editor Tool in Release 2014.1 (builds after 5250). This process is used primarily for providing an example to a customer, and to check that the document has been authored correctly.