If you have a twitter account, you can easily add this to your profile.
To do so simply follow these instructions:
1. Login to your account
2. In the User Menu click My Details
3. Move your mouse over the EDIT button just above your profile page
4. Click Update your profile
5. Click the myTwitter tab
6. Enter your twitter account name and twitter account number. The account number is the same number as your RSS feed on your twitter page
Or watch this video:
http://www.youtube.com/watch?v=NvZzlD5uoYk 
