#2 Feb 29, 2008 07:36
Yup. When someone registers it is up to you to give them permissions (of varying types) to post in any given blog. You can set up permissions for groups then put bloggers in groups if you want to do it that way too. Either way, check out the blog settings tab then permissions subtab to see where it's at.
BTW I believe the manual (Docs, up above) will have some groovy info on this topic for ya.