The green Chat button means a Psychic is online and available NOW for Chat.
This button can be found by the Psychic’s name on the All Psychics page and on the Psychic’s full bio. Tapping it will open a Chat window and will load (if any) past reading history you have with the selected Psychic.
Once in the chat window, you can type your message and press enter or tap the send button. Once both you and the Psychic have sent one message each, your Chat will officially begin, a timer will begin, and billing will start.