Have a Greetings Administrator Page on my home page after a friend helped me add a new site to my dashboard. There is an invitation to add new sites, which I am not interested in doing. The message refers me to a Options page to 1) disable registation, 2)allow user accounts to register, 3) logged in users to register or both sites and 4) user accounts to be registered. ( My host, Mediatemple, suggests this is a wordpress action).
AM interested in understanding what this registration is for and what actions I need to take to close the message and more sites promotion.