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 attack could be mitigated by enabling Sign's Registration Lock element, a method of two-variable authentication that requires the user to enter a PIN to register the phone number on a brand new unit.[146] A number of the organizers have moved to encrypted messaging https://www.lt-signal.com/