Agents can add unlimited signatures and choose from any of them when replying to a ticket. They can make one of the signatures their default which will automatically populate the reply box every time they view a ticket.
Signatures can be viewed beneath the reply area of the ticket – just click the Signatures tab.
Signatures can be added, deleted and updated directly from the signatures tab. They can also be updated inside the user profile if the logged in user has the appropriate security capability: edit_ticket_with_full_editor.