The email with the web link is to activate your site. It IS NOT the username that you will use to create configurable items to assign to the other sites you are responsible for setting up.
You will be getting an email from the regular VITA support email address with your group login and default password information. You will receive a groupadmin login and an (1) alternate groupadmin login
These may come a few days after you receive your site activation email (Remember: Patience is a virtue)