Make sure variable my-keybase-username holds your keybase username:
(setq my-keybase-username "username")M-x keybaseto open window with all chatskeybase-open-chatto select a chat to openC-c C-dto delete message at pointC-c C-eto edit message at pointC-c C-rto reply to message at pointC-c C-ato select a file to send as an attachment