1. Click on the human icon in the upper-right corner to get to the login page;
2. Sign in with your Graphisoft ID;
3. Register a username. Click on “Submit” to activate it;
4. You will find yourself on the home page of Graphisoft Community.
you should've been excluded from that list, so I am sorry if you received that email, must've been a mistake. It was intended for all those members that have registered Archicad Talk accounts but didn't migrate their content to the Community. You can be sure you finalized your process.