How Do I Use Multisite User Role Manager Plugin?

I read about Multisite User Role Manager - For WPMU installs, allows Super Admins to easily manage each users roles and blogs from one screen in the Network Admin menu.

I was hoping that new users would automatically be added to all sites but that doesn't seem to be happening so I installed this plugin and it shows what sites each user is on, but it doesn't show me how to add them to other sites.

Is there a different plugin that I should be using to make sure that new registrations get registered on all sites?

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