You can give your home page an easy-to-remember URL (e.g. debategraph.org/MyName) by clicking on the Share link (bottom left) and selecting Option 1. To replace the text here (e.g. with links to your Facebook, LinkedIn, or Twitter profiles) use the Edit details link (below). To update your account details (your name, photo, password, email address etc) use the Account button (above).
To create a new DebateGraph on any topic just click the New map button (below left).