点按 新增标签，建立新的标签名称与新增成员，或于新增成员中，将朋友加入已设定的标签内。 [105] The Threat of this assault could be mitigated by enabling Sign's Registration Lock characteristic, a form of two-variable authentication that needs the user to enter a PIN to sign up the telephone number on a whole new gadget.[146] Some of the organizers have moved to encrypted messaging https://www.lt-signal.com/