Go to http://en.gravatar.com/ and register, using the same email address which you used in order to register with the Answerbank. Follow the instructions to associate an avatar with that address.
Then go to 'My Profile' and 'Edit User Details'. Tick the box to make your avatar active. Click 'Submit'. (You might also need to log out, and then in again, in order to see your avatar).
Thanks to all you `guy`s and gal`s`. I`m off to bed right now and mull over your instuctions for to-morrow when I`m less tirerrrrrrrrd zzzzzzzzz zzzzzzzzzzz zzzzzzz.