If you want signature information to be automatically added to all emails created in FYI, you can do this by creating an Email Signature Stationery and setting the Default email signature option in the stationery.
You can also set up additional Email Signatures that are used instead of the practice's default. When a non-default email signature has been set up, to apply it so it is used of the default , it needs to be selected in the User Profile of the relevant user(s). Refer to Managing Users.
An Email Signature Stationery can only be added by an FYI administrator. For information refer to the article Adding Email Signatures to FYI.