How to send message in livechat window as livechat visistor in rocketchat app engine

as in the above image i want to send message to room in livechat when visitor click on any of the button i want to send message “billing” from vsistor side not as applogo avtar message
how can i do that
i am tyring to set message sender by id,username but no luck

need to send livechat message as modify.getCreator().startLivechatMessage().setVisitor(visitor).setRoom(room).setText(“hi”)

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Thanks for sharing, my friend! :hugs:

if you want to help us creating some examples on our Demo.App, be our guest :wink: