I have enabled signatures for forum users..

A signature is a attached to each post or comment that you make on the forums.

Users can create it in there profile (click "My Profile under the OpenVPMS logo) 

or click here if you are logged in

Then select the edit tab just under your username and scroll down till you see a section called signature then enter what you would like attached to the bottom of each post...in my case I always forgot to sign the post so I have.....(see the bottom)