It took me awhile, but our ITS department has given me a page for people to sign up and leave the Indigenous-L list here at Northern Arizona University. The URL for that page is
http://list1.ucc.nau.edu/cgi-bin/wa?SUBED1=indigenous-l&A=1
It can also me reached from my conference page at http://jan.ucc.nau.edu/~jar/SIL9brochure.html Thank you for your interest in our conferences. Jon Reyhner