to add a 'signature' to your profile (the bit at the bottom of each post you submit), follow this example
Go to Profile, then Forum Profile. Here you'll find options to add/change a custom avatar and change your profile personal text. (mine is 'Caerphilly Forum Moderator', as shown on left under my profile details)
Scroll down and you'll see how to add your birth date, gender (male or female symbol)and home location
You can also add ICQ, AIM, MSN and YIM details
Next you can add a signature, website name and website URL
Then it will look just like mine, below !