When you set up auto-create account lists at Settings > Analytics > Auto-Create Account Lists, Demandbase automatically subscribes Account Owners to receive the weekly Account List Snapshot email by default. See Set Up Auto-Create Account Lists.
Account Owners can unsubscribe themselves at Settings > My Profile > My Subscriptions by deleting the report.
To subscribe a user to the Sales Development Representative, Account Executive, or Marketing snapshot email instead, scroll down to the Configure Snapshot Subscriptions section and select the appropriate owner fields and the desired frequency. Click Create to create a new subscription or Manage to change one.