New Registration:
This is only for people who have never had a NISCA membership. Click on this link:

http://www.niscaonline.org/Membership/Register.aspx

Renewing A Membership:
This is for people who have had a NISCA Membership in the past. Click on this link:

http://www.niscaonline.org/Membership/Members/Renew.aspx 

Your username is your current NISCA number including the dash (i.e. 99-9999).