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Look in your Sys Admin | Preferences. You can set it up so that a certain group has to approve registrations.
Each module or block also has the ability to be hidden or shown for each group of users.
Start out your journey with the
Xoops FAQs, most of the questions new users have are answered there. If you spend a few minutes going though them all, you'll save countless hours and fustration later on.
And welcome aboard!