I've just pushed out an update to the website that has changed some of the general user interface to the website, but also, if you are a member, you are able to message other members. It could be a simple how are you doing, or you could conduct business (you are able to attach files!).
I think you may need to follow someone first before conducting a chat message, but after you've started your first conversation with someone, you should be able to chat with anyone.
// Please be aware that I believe there is no way to moderate chat messages. Therefore, chat messages have 0 moderation. Stay safe when chatting online.