Not accurate, the thread you posted show newbie can wear signature with maximum 50 characters. Newbie can no longer wear signature and personal text since merit implementation.
Due to excessive garbage-posting, you now need 1 merit to be a Jr Member. All existing Jr Members who didn't meet the requirement were demoted. Also, newbies can no longer set any signature or personal text.
So @OP, you need to spend more time, at least 4 months or it could be longer than that if you don't meet the 100 merit requirement for Full Member