The click to self-subscribe calls up a form into which you can input your details and select the "open" list to which you want to subscribe. You must create yourself a login name, a usual notation is to use initial.surname, as in j.bloggs. Please include your company name. This should be selected if this is your first time subscription to an Open Group list.

Otherwise select Subscribe, and send email to the list maintainer with the subject "Subscribe".

The Open Group will not pass your information to a third party.