To add users to the site, in the Available users list, select one or multiple users and click the add (>) button to move the users to the Users at site list.
To remove users from the site, in the Users at site list, select one or multiple users and click the remove (<) button to move the users back to the Available users list.
To assign all users to or remove all users from the site, clickthe add all (>>)or the remove all (<<) button.