This ^^^ would be the most easiest approach have them register then disable guest from seeing the boards.
you could also go as far as to set all new register(s) to be approved by admin's before there fully activated.
So that way after you friends have registered any one else who try's to register that is not permitted will not be activated unless you choose to do so.
you could also go as far as to set all new register(s) to be approved by admin's before there fully activated.
So that way after you friends have registered any one else who try's to register that is not permitted will not be activated unless you choose to do so.