Adrian ticking the "Signature" box will just display your signature. If you haven't put one in your User CP>User Profile>Change Signature... it will be blank, and I don't see anything here yet, so you need to do this. 
User CP is User Control Panel, and it's accessible first right above the Panhard Groups "brownish" navigation bar.
User CP is User Control Panel, and it's accessible first right above the Panhard Groups "brownish" navigation bar.