[Gryphon]

1. I am not sure why they are grayed out, this mod can't do anything about that, the user you are logged in as doesn't have permission by some TS setting not readily apparent. You have SA next to your name when you login?

2. step 5 of the registration process, they are not entering their Nickname, Guest is the default for TS users who do not enter a name. They still need to use step 7 and 8 assuming that you have passworded your server to something random, otherwise people can still join without registering. Only one login can be used at a time, no two people can use the same login at the same time. If you right click their name and look at the connection info, you can see the login id.