Router doesn't have Internet access

I have an EA6400, it is just doing wifii. I have it connected to a Cisco ASA. Clients have internet access via wifi and I can connect to the 6400's admistration page. 

However, the 6400 itself does not have interent access, it can't download updates, etc.

The 6400 will not let me add a default route like a cisco router will, for instance, 0.0.0.0 0.0.0.0 192.168.1.1

Not sure how to set up the 6400 in this scenario when it is not the router for the Internet connection. 

Thanks