Board Thread:Support Requests - Getting Technical/@comment-3225604-20130821095644/@comment-4018164-20130821124915

When storing signatures in user subpages, you must create that subpage in every wiki on which you edit.

You can, however, substitute your Community Central's signature like this: It would work in all wikis, though this sort of usage is quite uncommon and i suppose that most users just recreate the signature whenever they need it in a nother wiki.