Not sure if this is the right area to ask this: What rank it's required to add 2 or more signatures at the BTCTalk profile?
Member and above because it has an unlimited character for signature. Just refer to this guidelines.
https://bitcointalk.org/index.php?topic=178608.0BTW, I'm curious what are your purpose on wearing multiple signature while all campaigns requires only one signature at the same time?
Ha ha! Unlimited is misleading. There is a 4000 character limit on sigs which also includes the BBcode used for formatting. For example, my sig uses 1077 characters even though you only see about 90 characters.