I think if you need to read documentation to work a website then the website design has failed. People don’t come here to read documentation, they come here to play Go. If people who know how to play can’t figure it out by just clicking around then i think there’s room for improvement.
I don’t know how the sign up process is but i know it’s deliberately very easy. Maybe adding a step of offering a tour or even asking if you know other users already and allowing then to be added to the friends list would help with setting someone up?