You are a member, and because you had no been logged in the past 30 days, your member status has reverted to New User, as indicated under your membername. To move from New User to User, you need to have a minimum of 5 posts, and login at least once every 30 days. At present, you have 2 posts since joining in August.
Once you become a User, you will have the ability to initiate a conversation (or Private Message/Direct Message) to other members. Even as a New User, you can reply to messages sent to you,