BuddyPress.org

Why do they find they can’t post anything?

You need to take a little more time to play and test your install, create a user ensure you have enabled create user blogs in the main options under super admin on the main blog then logged in as that new user create a new blog or register a new user and create a blog at same time., and re read my post above re upping the users capabilities/role, you don’t for a user blog.