For some reason I don't see in Jupernia's profile page the "show/hide user customization" button... while I see it on the other profiles after a quick spot check...
@Dai-kun- I did not find similar issue in the support
Scrap that... If the profile is not customized, there is nothing to hide or show... So no button (I found other examples of the same)
---- EDIT ----
The link in the FAQ is not valid any-more as the Customize Profile function changed and the customization of your profile is done via the Profile page itself as Twinstar showed the location of it in her post.