Contact: 1, Apple mobile phone nail-message page, select contact-label and draw left; 2, Android phone nail-message page length press contact-label. Group chat: 1, mobile phone/computer nail-select group chat-upper right corner ... /set button label. 2, Android phone nail-message page length by group chat-tag. 3, Apple mobile phone nail-message page select group chat left stroke-label. Chat message (link, text, rich text, picture, video, document, knowledge base, table, file): 1, mobile phone nail-long press chat message (Android phone)/select chat message left stroke (Apple phone)-collection. 2, nail the phone-long press the chat message-multi-choice-collection-select the label; 3, computer nailing-mouse on the chat message-left/lower right corner ...-collection-selection label; 4, computer nailing-mouse on the chat message-left/lower right corner ...-multi-selection-collection-selection tag.