There are several reasons why a list might not be visible. Some lists
are not publicly visible and are only visible to subscribers once they
have logged in. To subscribe to a hidden list, send mail to listname-subscribe@lists.riseup.net.
Most
lists which are hidden are also private, so your list subscription will
need to be approved by the list owner. If you are a list owner and you
want to make your list visible, you must set the Who can view list information option to list is visible in the directory of lists (anyone).
The other reason a list might not be visible is that it has not been created yet. When you fill out a list request, the list becomes visible and editable by you, the admin. The list is not accessible by others until the list is actually approved.