This is a user manual of Bluesignal Android client. It describes how to download, install, login, use the home page, messages, send text, images, audio, files, videos, locations, red envelopes, receipts, copy, delete, forward, chat information, invite members to join discussion groups, remove members from discussion groups, modify group names, pin messages, unpin messages, set whether to receive new messages, set messages as common contacts, set the chat background of the current message, search chat history, clear chat history, and delete and exit discussion groups.