Go to the top right where it says your name "Snake19" then click on "Personal details." Once in there you go to "Custom title" and you can change it :D
Where is custom title ? ^^ i don't see it : http://image.noelshack.com/fichiers/2016/34/1472002245-fofo-prob-2.png
It should be below your avatar https://zapodaj.net/a332b33ce6e15.jpg.html but custom titles are a donator perk, maybe your donator perks ran out?
I believe ribbons are permanent, while things like custom titles are active perks that go away once your donation period expires. https://forum.thd.vg/threads/forum-donations.5156/page-12#post-273980
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