Use a USB (MAC) to console (ASA) adapter and plug into the ASA console port. Open a terminal window and log in to the device that way.
Assuming you have credentials, log in to exec mode (enable) and issue the command "show ip". That will tell you the device's configured IP addresses and interfaces.
Once you know the IP addresses, you can follow the Quick start guide with that minor change.
If you want to restore to factory default configuration, please see here.
If you don't have the necessary credentials for the above steps, you can perform a password reset via console using this procedure and then use the above procedures.