hope you don't mind me responding. I was waiting for a reply on a post I made yesterday and saw your question.
I believe MBA Enable Membership Screening (AKA MBA)
can be found if you go to you ADMIN Center:
Under Board Settings
Go to Edit Board Settings
Once in Edit Board Settings
Go down the page to Security
Itís the second option right under Who can see IPs in posts?
Check MBA and then click on Save Changes at the bottom of the page.Nickdisk
posted a reply here MBA
that tells you what MBA is and where you can locate it.
This is what you're looking forÖ
Hope that helps and Good Luck!