There is no enable mode like Cisco has it. Instead, with ExtremeXOS you have admin and user accounts. As the switches were reset to factory default I suspect that you log in with user "admin" and without a password. With this user, configure whatever you like, save the configuration (the command is "save") and you are done.
However, everything you configure should show up in the configuration. This is in real-time, at least with XOS 15.3 and upwards. I do not know older releases and how they behave though.