Is the green 'NETWORK' LED on? If so, this means it is connected to your cable modem wifi. When you get a connection like this the board disables it's AP.
The best way to change the WiFi config now, is over the USB console interface. Please see the "Pro" section of the Quick Start doc here: http://www.esquilo.io/docs/#quick-start-pro-quick-start. Follow the instructions there to get a terminal to the console over USB, first.
Then, list the configured WiFi stations with:
sta list
It should only have your cable modem. Something like:
eos> sta list
SSID Security BSSID Chan
-------------------------------- --------- ----------------- ----
cable wpa2-aes aa:bb:cc:dd:ee:ff 5
Remove the configured network with:
sta del <ssid> <security-type> (e.g. sta del cable wpa2-aes)
Now if you reset the board, the Esquilo AP should come back up and you should be able to redo you original setup.
Note: you can also just continue setup over the console, if you like. First, scan for networks:
wifi scan
Find the network you want to join and add it:
sta add <ssid> <security-type> <key>
And join it:
sta join <ssid> <security-type>
To check the status:
sta