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 is often mitigated by enabling Sign's Registration Lock feature, a type of two-element authentication that needs the person to enter a PIN to sign up the contact number on a new unit.[146] Some of the organizers have moved to encrypted messaging applications https://www.lt-signal.com/