To connect your Envoy to your wireless router you need to use the Enphase wireless adapter. 

To install the wireless adapter;

1. Plug the wireless adapter into the left USB port (looking at Envoy from the front), and wait for 10 seconds. 

2. Press and hold the WPS button on the wireless router (or access point) for two seconds. On many routers, the WPS button flashes at this point. Within two minutes, return to the Envoy. 

3. Press and hold the Envoy menu button until the Envoy Menu appears. Release the Envoy menu button when Enable Wi-Fi WPS appears on the LCD screen. Within two minutes an updated IP address appears on the Envoy LCD screen. This IP address begins with a “W” to indicate that a wireless connection is established. 

If the updated IP address does not appear, retry the previous steps as the connection window may have timed out. Within a minute, the Envoy LCD screen displays +Web, indicating a successful connection to Enphase

For more technical notes on this set up visit page 13 on the link below: