It's in My Profile, here Edit Community Profile bit ;)
If that doesn't work, please come back as a few people were missing that Custom User Title line.
The link at the bottom of your post works for me - sorry, brain dead atm.
O.K., you meant Your Forum Signature & you found it - above wardrobe - sorry going to put head in bucket now :(
It's here - My Profile, scroll down past your posts, etc., just above wardrobe ;)
(I thought 'cos you had one that you'd found it)
You're welcome, Palmbeach - might be faster next time :)
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