1. Allow here on this screen ( better both) the

"Enable membership by applying: " or/and
"Enable membership by password: "

and enter an appropriate password - (you can send it your students by mail… or Private message)

2. insert ( within extra lines !) on your Joining page "system:join" ( title=" How to join this site?" ,the "landing page" of the "private " site for non-members) .

2.1.for "Applying for membership"

[[module MembershipApply]]

(usually found at page system:join, but you can put this piece of code anywhere)

2.2. for "Enable membership by applying":

(It is also possible to become a member by providing a valid password. The corresponding widget (form) is generated by the module

[[module MembershipByPassword]]

3. Landing "new" visitors, who are not members of your site, can enter here the password and are immediately member of your site.

And - if someone does not know the password can write a little text into the applyment box and You will get a notification that in the site manager under the menu point > Members > Applications there is a new member asking for acceptance or declination.

In such a manner is the membership-creation working.

Hope this helps?

Edit1: I copied it onto the help:emergency-help .

Edit2: O copied this in a howto: http://community.wikidot.com/howto:how-to-let-people-join-my-site