by Steve Ambro v2.7+.
Yes, they cannot create new accounts. Interesting, I don't seem to relate an educational process as an "account" but I guess it is...
The first two paragraphs in that "Email-Based Registration" link:
"An administrator can enable email-based self-registration in Administration > Site administration > Plugins > Authentication > Manage authentication."
It talks about Locking and Unlocking but does not say what either means.
"In addition to enabling the plugin, email-based self-registration
must be selected from the self registration drop-down menu in the
common settings."
Where are these "common settings"?