There are a few reasons you may be locked out.
Make sure you're logged in.
AACRAO Membership does not include access to EDGE. If you're interested in Subscribing to Edge, find out more here.
Though your institution may have purchased an EDGE Subscription, you may not be on it. The Edge Manager for your account needs to assign your account to the Subscription for you to have access.
When your Subscription is renewed, your assignment may not have rolled over. Verify that the appropriate Subscribers are listed using the "View EDGE Subscribers" tab. Your EDGE Manager can reassign you to the EDGE Subscription.
If you are certain that you are logged in correctly to an account already assigned to an active EDGE Subscription, the problem may be with your browser. Resetting your cache and cookies and logging in again should solve the problem.