Can anyone help me to finde where is in the control panel the option to add usernames that cannot be chosen to register an account? I have a website about cars and I would like to protect some brand names as Audi, Ford etc to be register by new users, but I have been looking everywhere in the control panel and I cannot find it. Can you please help me? Thanks!

Members → Ban Settings 

Thank you! I knew I have seen it somewhere lol