To access both the my.ava.org and Legacy ESR club management features, please create a personal my.ava.org account then set up club management privileges for your account as described in the tutorial (link):

Setting up Club Management Privileges

The legacy club logins have been and continue to be a security risk. Given all the stories about hacked web sites, we must remove this capability. All of the clubs have been contacted and it appears that very few (<5%) have not made the transition to a personal login.

As a note, this transition date has already been extended. This is too important for the health of AVA to extend the legacy login use further.