How can i Add a Group so when people login to the Messenger the all go to 1 Group…?
If you already have some users. You can create group and add all these users to that group. Then you will have to enable group sharing. (Users ? Groups - Edit Group - Enable contact list group sharing). So they will automaticly see all other group’s members after login.
If you dont want to add all new users to that group manually after registration, you can use Registration plugin (http://www.igniterealtime.org/projects/openfire/plugins.jsp) and set a group to which all new registered users should be added to automaticly.